Commercial pilots must complete a flight review every:

Commercial pilots are required to complete a flight review every 24 calendar months to ensure that they maintain their flying skills and stay up to date with regulations and procedures. This review typically involves a minimum of 1 hour of flight training and 1 hour of ground training, covering areas such as air traffic control procedures, weather, and emergency operations.

The purpose of this requirement is to promote safety and competency within the aviation community, reminding pilots of the importance of ongoing training even after they have received their commercial certification. This 24-month interval helps prevent skill degradation and reinforces the need for continuous learning and adherence to aviation standards and practices.

In contrast, the other timeframes listed (12, 18, or 36 months) are not aligned with the regulations set forth by the FAA, making them incorrect choices.