For vessels greater than 40 ft, what is the fatigue limit at a sea state of 4-8 ft?

• A. 6 hours
• B. 8 hours
• C. 10 hours
• D. 12 hours

Answer: (B)

Fatigue limit here means the maximum continuous period a crewmember should work before fatigue noticeably impairs performance. For vessels greater than 40 ft, in a sea state of 4–8 ft the system design and typical watch patterns assume an eight-hour limit. This moderate vessel motion makes extended work periods more tiring, so eight hours allows a crew member to stay alert and capable while fitting into standard rest and rotation schedules. Shorter periods would be unnecessarily conservative, but longer durations raise the risk of reduced judgment and slower reaction times in challenging seas.