How many hours of rest do you need in a 168 hour period?

• A. 24 Hours
• B. 36 Hours
• C. 40 Hours
• D. 30 Hours

Answer: (D)

Fatigue management hinges on ensuring enough off-duty recovery time within a weekly cycle. In aviation terms, a 168-hour period is one week, and the minimum rest required in that span is 30 hours. This rest can be taken in multiple blocks, as long as the total adds up to at least 30 hours, giving you time to sleep, recover, and reset between duty periods. The idea is to balance duty time with enough weekly recovery to maintain alertness and performance. The other numbers would not meet the minimum recovery standard, while 30 hours represents the baseline requirement that helps protect safety and sustain performance across the week.