This is also gong to help keep them from keeping you out for so long.

(d) If a flightcrew member travels more than 60o longitude during a flight duty period or a series of flight duty periods that require him or her to be away from home base for more than 168 consecutive hours, the flightcrew member must be given a minimum of 56 consecutive hours rest upon return to home base. This rest must encompass three physiological nights’ rest based on local time.