Fatigue is seen as significant contributory factor to many incidents in shipping industry. And the aim of the rest hour requirements is to avoid or minimise fatigue.

But compliance with rest hours requirements has become the seafarer’s worst nightmare these days.

Not only you and your ship staff need to be well rested each day but you also need to prove it to the authorities.

Worst, when authorities compare the rest hours records with other documents like

  • drill records
  • Enclosed space entry permits
  • Bunkering operation timings
  • Tank cleaning records
  • port arrival and departure times
  • Bridge watch levels

And countless other records.

Mind you, regular non-compliance with the work and rest hours requirements can be the reason enough for the detention of the vessel by port state controls.

The best way to avoid this nightmare is by understanding the rest hours requirements.

What complicates it further is that we had multiple regulations stating the same requirements but in the slightly different way.

These are

Thankfully after Manila amendments to STCW code, the STCW 2010 requirements are made in line with the MLC requirements.

Now, all we need to worry about is to comply with one requirement and others will be complied automatically.

OPA-90 requirements are for crew working on tanker vessels trading in US waters and these still have slightly different requirements than STCW and MLC.

For understanding the work and rest hours requirements, I will focus on STCW requirements in this article.

STCW Requirements for Work and rest Hours

STCW Chapter A-VIII/1 (Fitness for duty) defines the work and rest hours requirements.

Let us understand each point of the regulation one by one.

a minimum of 10 hours of rest in any 24-hour period

The first requirement about the rest hours is to have a minimum of 10 hours of rest in any 24-hour period.

Let us say below are the work and rest hours for 1st of a month for a seafarer.


Does this comply with the 10 hours rest in any 24 hours period?

Yes, of course !!! In this day the seafarer has got the rest from 0000-0600 hrs and then 2000-2400 Hrs amounting to 10 hours.

But there is more to this requirement than it meets the eye. Let us say next day this seafarer came to work at 0500 Hrs and knocked off at 1000 Hrs. After that, he was off for the full day.


Does it still comply with 10 hours rest requirement?

No, it does not comply now. Why?

The requirement is for 10 hours of rest in ANY 24 hour period. I can choose any 24 hour period and check if he got 10 hours rest in that period or not.

In this case, I choose 24 hour period from 0600 Hrs on 01st day to 0600 Hrs on the next day. Count the rest hours in this 24 hours period.


It comes out to be 9 hours only. So in this 24 hour period, he got total rest of 09 hours only and would not comply with the 10 hours of rest requirement.

The takeaway point is that the word “any” is important in this requirement.


2) minimum 77 Hours of rest in any 7 days period

This is similar to the earlier requirement we discussed but it takes into account the rest in 7 days period.

The word “any” is again important in this.

The 7 days period is not necessarily from midnight to midnight. It can be any time of any day and 7 days period thereafter.

So I can choose 0900 hrs on 2nd May to 0900 Hrs of 09th May. Or I can choose from 1200 Hrs on 12th May to 1200 hrs on 19th May.

Irrespective of which 7 days period I choose, the rest hours need to a minimum of 77 hours.

3) Rest may be divided into no more than 2 periods, one of which need to be at least 6 hours

We need to have at least 10 hours of rest in any 24 hours, that’s OK. But we need to have some hours of continuous rest too.

If a crew is made to work on 3 hours on- 3 hours off basis, he would not be considered as sufficiently rested even though he gets 12 hours of rest in 24 hours period.

This requirement checks that.

It requires that the required 10 hours of rest in any 24 hour period

  • May be divided into no more than 2 periods
  • one of these periods need to be at least 6 hours

So the required 10 hours rest can be in combination of

  • 6 Hours + 4 hours
  • 7 hours + 3 hours
  • 8 hours + 2 hours
  • 9 hours + 1 hour

The second requirement is that the “rest may be divided into no more than two periods”.

For example, the 10 hours rest in a combination of 6+2+2 hours will not work. This will be the violation of rest hours requirements.


But then what about 6+4+2?

Rest hours STCW divided into three parts

In this case, the rest hours are divided into three parts. Does it still comply with the work and rest hours STCW requirements?

Yes, it does. The requirement is about dividing the minimum 10 hours of rest into no more than two periods. Any rest hours above that will not violate the maximum two periods requirement.

4) Interval between consecutive period of rest shall not exceed 14 hours

The more simple way to say this is “a seafarer shall not be put to work continuously for more than 14 hours”.

If the condition of 10 hours of rest in any 24-hour period is satisfied, this condition will be satisfied automatically.

5) Exception to 77 hours of rest in any 7 days

As per STCW

Parties may allow exceptions from the required 77 hours of rest in any 7 days, provided

  • the rest period is not less than 70 Hours in any 7 days period
  • the exception is not allowed for more than two consecutive weeks

Let us say a crew’s work schedule is from 0600 Hrs to 2000 Hrs each day. This schedule would comply with 10 hours requirement as well as break up of these 10 hours requirement.

It does not comply with 77 hours requirement in any 7 days period.

The exception allows this work schedule to continue but it has three conditions.

First, the rest period should not be less than 70 hours in any 7 days. So in our example, it would comply with this requirement as the rest hours in 7 days period is not less than 70 hours.

Rest hours in 7 days period with exception

Second, this exception is not allowed for more than 2 weeks.

So for our example, this schedule can continue till 14th of month. For the third week (14th to 21st), the rest need to be not less than 77 Hours.

And the third condition is, the interval between two periods of exceptions shall not be less than twice the duration of exception.

So if the exception was used for one week, the next exception can only be after two weeks.

exception for rest hours 77 hours rule

And if the exception was used for consecutive two weeks, the next exception can only be after 4 weeks.

exception in rest hours for 2 consecutive period

As we discussed, this exception cannot be used for more than two consecutive weeks.

6) Exception to 10 hours of rest divided into no more than 2 periods

STCW provides the exception from the requirement of dividing 10 hours of rest in no more than two periods, one being not less than 6 hours.

As per this exception

10 hours of rest may be divided into no more than three periods

  • one of which shall be at least 6 hours in length
  • neither of the other two periods shall be less than one hour in length
  • Exceptions shall not extend beyond two 24-hour periods in any 7 days period

So this exception allows the 10 hours rest to be divided into three parts as

  • 6 hours+3 hours+1 hour
  • 7 hours+2 hours+1 Hour
  • 8 hours+1 hour +1 hour
  • 6 hours+2 hours+2 hours

But this exception can only be used for maximum of two times in any 7 days period. Again the word “Any” is important in “any 7 days”.

Let us say this is the rest hours break up of one crew in a 7 days period.

two period rest hours exception

As we can see, the exception to divide the 10 hours of rest in 3 periods has been used twice. So this is fine.

But if it was used for three times in this 7 days period, it would be the violation of rest hours requirements.

The break-up for day 4 will not be considered as dividing the rest hours in 3 parts because 10-hours of rest has been divided in two parts. The next 2 hours of rest can be considered as extra rest and not part of 10 hours of rest.

Drills, training and rest hours requirements

One of the most frequently asked questions about rest hours requirements is, “if the time spent during drills will fall under rest hours or work hours?

Here is what you need to know about time spent during drills.

This time needs to be entered as “work hours” but for the compliance with the rest hours requirements, it will not be counted as work hours.

What does that mean?

Let us say this below are the work hours for one crew for a day which includes drill from 1700 to 1800 Hrs.


Even after showing drill timings as ‘work hours”, we are complying with the Work & rest hours requirements.

But let us consider these rest hours timings for two days, say 19th and 20th Dec 2017?rest-hours-with-drill-compliance

The drill was carried out on 19th Dec 2017 between 1800 Hrs to 1900 Hrs.

Is the ship complying with work and rest hours requirements?

No. Because if we consider 24 hours period from 0800 hrs on 19th Dec, there are only 9 hours of rest.

But what if we consider the drill timings as “period of rest”. You will see that in this case, we will comply with rest hours requirements.

The point I am trying to make is this.

We need to mark the drill as work hours but for calculation of compliance with work and rest hours, we need to consider this as rest hours.

The below flow chart can make this little easier to understand.

Rest hours requirements during drill compliance

Dealing with rest hours non-compliance

We have discussed the STCW requirements for work and rest hours. These need to comply with at all times.

Even if sometimes these cannot be complied with, the exception to these rules can be allowed as per the STCW requirements.

But it will be the violation of STCW and MLC if the rest hour requirements are not met even after the allowed exceptions.

Master and department heads need to be proactive in assessing the situation and must know about any situations that would lead to non-compliance with rest hour requirements.

When identified, the master needs to act and allow the required rest to the concerned crew.

If it requires the master to delay the berthing of the vessel, the master must not hesitate.

But what if the non-compliance has already resulted and was identified only after it had happened.

In this case, the company’s procedure for dealing with rest hours non-compliance need to be followed.

To avoid the issues with “port state control” in future, it is advised to make a Non-conformance report” with corrective and preventive action taken. The company should send this to flag to close the matter.

This NCR and response from flag can then be attached to the rest hours.

Rest hours Calculation Softwares

The STCW rest hours requirements are complex. If I give a weekly rest hours sheet of a crew involving various activities such as port arrivals and departures, it will not be easy for you to check if this complies with all the requirements.

That is where rest hours software comes handy.

Most of the companies have provided a software on board to help master and officers check compliance with the crew rest hour requirements.

The most used software in the industry is ISF Watchkeeper.


The best part of this software is that it takes into account all the regulations related to work and rest hours.

For example when in US waters, the crew of the tanker vessels also need to comply with OPA-90 requirements of work and rest hours.

In ISF watchkeeper, the Master (with admin password) can check the OPA-90 option and it will check the compliance with these requirements.



Fatigue has been identified as one of the major factors in maritime incidents. This makes it so much important to address this issue and to ensure that seafarers working on ships are not fatigued.

Work and rest hours requirements set a regulatory framework for the minimum rest hours each seafarer need to be provided.

In a nutshell, STCW 2010 requires

  • 10 hours of rest in any 24 hours which may be divided into no more than two periods, one being at least 6 hours
  • 77 Hours of rest in any 7 days period

STCW 2010 also provides some exception to these two important requirements.

It is the duty of the master and department head to ensure that there is no non-compliance with the rest hours.

If any non-compliance is identified, the company’s procedures must be followed to deal (and close) with such non-conformance.

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Capt Rajeev Jassal

About Capt Rajeev Jassal

Capt. Rajeev Jassal has sailed for over 19 years mainly on crude oil, product and chemical tankers. He holds MBA in shipping & Logistics degree from London. He has done extensive research on quantitatively measuring Safety culture onboard and safety climate ashore which he believes is the most important element for safer shipping.

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Satyajit Dilip
Satyajit Dilip
Jan 2, 2018

Excellently explained. Appreciate the slides you have made to explain it. So much easier to understand. In the class we were told that after you have taken 2 weeks consecutive exemptions, then before you get into the next exemption, you have to take permission from Flag state. Wanted to confirm with you if this is so?? Also if a PSCO boards vessel just after vessel has berthed and ask for the work and rest hours in the last 24 hours of the crew member who was at the gangway and if it does not comply, then can we apply the not more than 2 exceptions per week in this scenario to get away with this observation??

Rajeev Jassal
Rajeev Jassal
Jan 9, 2018

If 2 exceptions have been used, next exception can be after 4 weeks. In this case, there is no need to take permission from flag state. We cannot take permission from the flag if we want to have the exception before 4 weeks in this case. There is no provision that allows violating the rest hours requirements with flag state permission. If we see that rest hours may not comply today or next day, we need to stop (anchor) the ship. Role of the Flag state would only come if some violation has already happened and it was realized later after it had happened. The company can inform the flag state of preventive actions taken to avoid issues with any PSC. regarding the second query, yes we can apply the allowed exceptions.

Ercan Altay
Ercan Altay
Jan 2, 2018

Thank you i read all your topics and i realy appriciate you as i found many answers on your writings

Rajeev Jassal
Rajeev Jassal
Jan 9, 2018

Thanks, Ercan...

Jan 4, 2018


Rajeev Jassal
Rajeev Jassal
Jan 9, 2018

6 Hours on/off will not comply with rest hours requirements if we take into account hand over period. That is the reason many companies are shifting to 7 hours +5 Hours working arrangements. But of course when we use 6 on/Off, we do not take into account the hand over period while recording rest hours.

Jan 9, 2018


Raju Yadav
Raju Yadav
Jan 8, 2018

Very helpfull .keep writing..... thanks

Rajeev Jassal
Rajeev Jassal
Jan 9, 2018

Glad you found it helpful Raju...

Jan 15, 2018

Hi! I Have a question regarding drill and training. You write that it should be marked as working hours but state the reason for the non-compliance as drill and training. What regulations can I refer to if the Captain on board don't agree? Best regard Anders

Jan 16, 2018

Good day sir Thank you very much for the rest hour regulation explanations I have a doubt regarding same Officer and crew engaged as a part of first navigational watch and the further watches shall take adequate rest right How much is this adequate amount of rest for this purpose Ia it a complete 6 hour before watch or the normal criteria for daily compliances are enough.

Capt. Shailendra  K Singh
Capt. Shailendra K Singh
Feb 17, 2018

Thanks for sharing Rest Hrs Clarification in very simple words.

Raman Kumar jha
Raman Kumar jha
Feb 18, 2018

Dear Sir, Excellent explation regarding Work/Rest hours. Easily understood. Thanks a lot.

Francesco Montalbano
Francesco Montalbano
Mar 12, 2018

Explain how is calculate on Isf wk3 hrs of rest in any 7 days periods This takes into account the rest in 7 days period. The word “any” is important in this. The 7 days period can be any time of any day and 7 days period thereafter. So I can choose 0900 hrs on 2nd March to 0900 Hrs of 07th March , as well as I can choose from 1200 Hrs on 5th march to 1200 hrs on 12th March Irrespective of which 7 days period of rest or work I enter , has been noted that in the coluun any 7 days the value Computed does not change

Aswin Kalarikkal
Aswin Kalarikkal
Apr 16, 2018

Good day Captain. Why are these requirements different for different conventions?

Jun 23, 2018

Hello, Great article, along with all your other articles. There is a debate of what the MLC/STCW hours of work and/or rest are under international law and UK law. Your article, MLC, STCW and the MCA state the MINIMUM requirements for REST as 10 hours in a 24 hour period & 77 hours in a 7 day period. MLC and the MCA talks about MAXIMUM hours of WORK as 14 hours in a 24 hour period & 72 hours in a 7 day period. See MSN 1888 annex Aii. "5. The limits on hours of work or rest shall be as follows: (a) maximum hours of work shall not exceed: (i) 14 hours in any 24-hour period; and (ii) 72 hours in any seven-day period; or (b) minimum hours of rest shall not be less than: (i) ten hours in any 24-hour period; and (ii) 77 hours in any seven-day period." The key question is, what does "OR" really mean? The flat state decides now does it? Which flags enforce hours of REST and which flags enforce hours of WORK? The big question is on any ship worldwide, or a UK ship, are you allowed to work 6 hours on 6 hours off for 7 days or more? That would be 84 hours of work that week and you would therefore get 84 hours of rest - minimum rest is ok (>77). However that would also be 7 hours OVER the 7 day maximum of 77 hours. Somebody read somewhere that the flag state decides whether they will adopt the minimum hours of rest or maximum hours of work and that the MCA does comply with MINIMUM hours of REST only and DON'T adopt the MAXIMUM hours of WORK. What about other flags? But there seems to be some confusion over this area. Exceptions exist but it's all rather hazy. Any thoughts? Richard

Steven May
Steven May
Jun 26, 2018

Hello sir great article indeed..just one query what about tea breaks should it be shown also on rest hours or it’s just counted as working hours since I have experience different opinions from pre vetting inspectors stating that it should show rest period some say it should be counted as normal working hours ..always create confusion to me..can u clarify on this..once again thanks for the great article

Anu Prabhudesai
Anu Prabhudesai
Dec 13, 2018

Seajobs are quite tough and taxing. Employees work under stressful conditions and I feel that the workers should have ample hours of rest as per the set organisations schedule. It will enable them to give their best performance for the success of the organisation.

Dec 16, 2018

Hello, Captain In offshore vessels is very usual the 6/6 watchkeeping, what means 12 work hours a day, everyday during 28 days (in Brazil). 7x12=84 hours. But the Regulations says that cannot have more than 72 work hours in any period of 7 days! How is this accepted so naturally worldwide?

Albert THL
Albert THL
Feb 23, 2019

How to split minutes in working and rest hour in watchkeeper client3, Example if i work from 08:00 to 12:10, then it working hour is 08:00 to 12:00 or 08:00 to 12:30?

Apr 15, 2019

Hi Capt. Good day, kindly advice as the 4 to 8 watch he start his work 0400 and complete at 0800 for any reason he do some work at 1030 to 1130 and get rest to start his watch at 1600 to 2000 , the question this will be violent to MLC as his rest lest than 6 hours or this will calculate from 2000 to next day 0400. Kindly advice with many thanks

May 10, 2019

While working on a schedule of 4 x 8 i work from 0400 to 0800, and 1600 to 2000, but do 2 extra hrs til 1000 in morning . If i were to work 8hrs in a row till 1200, how many hrs of consecutive rest will i need? 6? taking into account i am supposed to come on watch from 1600 to 2000. Thank You

Neil MacCallum
Neil MacCallum
May 16, 2019

Hi there Part of a 7 day shift starting at 0600 on the day in question. Worked from 0600 until 1900 (30min lunchtime at 1300hrs) then rest period until Emergency call out from 21.30 until 0000hrs rest again until shift start at 0845 (delayed shift start from usual 0600) until 1900hrs ( 30 min lunchtime at 1300hrs again) are we compliant? ie was the compensatory rest period ok bringing up to 10 hr 15 min rest from end of shift prior to emergency? Many Thanks

Neil MacCallum
Neil MacCallum
May 16, 2019

Previous comment should have read 0745 not 0845

Ggwp 322
Ggwp 322
May 17, 2019

Mlc is bullshit they shoud take measure about seamen rest hours.they give only regulation no any action is done

Arjun Singh
Arjun Singh
Jul 12, 2019

To know how to manage Work and rest hrs without any delay visit,

Ajit Chavan
Ajit Chavan
Aug 5, 2019

I am now onboard on a UMS class product tanker, we did 6 on 6 off for period of 26 May to 20June, then normal 0800 hrs. to1800 hrs. schedule & now from 27 July to 5 August, does it comply with rest hour regulations

Pedro Ferreira
Pedro Ferreira
Oct 7, 2019

Good day, if a Crew members works more than 14hrs continuously, lets say 20hrs, how many hrs rest he should take after that period to avoid non conformity? "Safety the Vessel or Cargo excluded".

Harbinder Singh
Harbinder Singh
Oct 8, 2019

Dear Sir, Excellent explanation regarding Work/Rest hours. Easily understood. Thanks a lot. Request for OPA 90 rest hours requirement in the near future.

Aman deep
Aman deep
Oct 9, 2019

Thank you for your explanation sir, I would like to know what is the diff between MLC rest hours and STCW rest hours. Which one a vessel needs to complied with?

Alan pearson
Alan pearson
Oct 30, 2019

Can you work 8hrs on 8hours off

Alok Ranjan
Alok Ranjan
Nov 17, 2019

Rest hour old records keeping requirements for how many year.

Kadir Sert
Kadir Sert
Apr 26, 2020


Amar anand
Amar anand
May 6, 2020

Great article sir.....

May 16, 2020

Hi Rajeev. Thanks a lot for your explanation. I have a query: (6 + 3 + 3) will this rest hours combination meet the requirement of maximum two rest hour periods? Does it pass because total rest hours is greater than 10 or it fails because the min 10 hours rest is divided into more than two rest periods

May 16, 2020

Hi Rajeev, please permit me to give a link in my software to your blog above?

Jun 1, 2020

Hi Capt. , I would like to know if you if the Manila amendments apply to watchkeepers only or does this apply to non-watchkeepers as well , where the 10 hours may be split up into more than 2 periods one of which shall be a minimum of 6 hours

Jun 20, 2020

As far as I can tell from the screenshots, that software is calculating things wrong. Resting hours divided into not more than 2 parts here but one is not always being at least 6 hours in ANY 24 hour period (take a look at between 01:00 and 01:00) Or am I wrong?

angel balagtas
angel balagtas
Sep 1, 2020

30minutes break is considered rest hrs example lunch break

Neil Weston-Stokes
Neil Weston-Stokes
Oct 21, 2020

This is a great explanation of work/rest regulations, please contact me at for a demo of ISF Watchkeeper.

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Sheila Donnell
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