Hours of rest
Rest hours calculator.
Check a day against the MLC and STCW limits: 10 hours of rest in the day, no more than two periods with one of at least 6 hours, and 77 hours across the week. Free, and nothing to sign up for.
The day
Enter each rest period in the 24 hours. An overnight sleep that crosses midnight: enter the part that falls in this day.
Breaks under one hour are not counted: under MCA guidance (MSN 1877) a break must reach one hour to count as rest. Periods of an hour or more beyond the main one or two count toward the weekly total.
The week
Seven daily rest totals, in hours. The limit is 77 hours in any 7-day period.
This page is guidance, not a compliance record, and it can only see the day you type. The regulation tests every rolling 24-hour and 7-day window, which needs yesterday's hours too. How the rolling windows work
The app runs these checks on every logged day.
In The Muster App, crew log rest on their own phones and every day is checked over the rolling windows, offline included. A day that crosses a limit names the rule and asks for a comment, and the signed monthly record prints with its comments attached.