Crew day shall not exceed ____ hours and _____ hours should be provided for rest before the next crew day.

The correct answer states that the crew day shall not exceed 12 hours, and 12 hours should be provided for rest before the next crew day. This is aligned with safety regulations and industry standards designed to ensure that crew members have adequate time to rest and recover between work periods.

Having a maximum crew day of 12 hours helps to mitigate fatigue, which is essential for maintaining performance and safety in operational environments. At the same time, providing 12 hours of rest allows for proper recuperation, which is crucial for the well-being of the crew and effective task execution.

If shorter crew days or rest periods were implemented, this could lead to increased fatigue and a higher risk of errors or accidents, which in turn would negatively impact operational efficiency and safety. Thus, the 12-hour limit and the corresponding rest period are critical for optimal crew health and performance in demanding work scenarios.