Final answer:
Extended rest periods are necessary when a flight exceeds FAA limits to ensure safety and crew recovery. The specifics of rest time depend on the extent of the duty period extension.
Step-by-step explanation:
When a flight goes over flight or duty limits set by the Federal Aviation Administration (FAA), rest periods should be sufficiently extended to ensure the crew's safety and well-being.
The exact amount of rest required can vary depending on the specifics of the flight duty period extension and the regulations in place, which are continuously updated to address the safety concerns of operators. In general, the aim is for rest periods to be long enough to provide complete relief from duty and to allow for sleep and recovery.