How many days may the holder of a pilot or instructor certificate exercise privileges after a change in permanent mailing address without notifying the FAA?

The correct choice indicates that a pilot or instructor certificate holder may exercise their privileges for a period of 30 days after changing their permanent mailing address without notifying the FAA. This timeframe allows for a reasonable duration in which the certificate holder can manage the process of updating their records with the FAA.

This requirement serves to ensure that the FAA has accurate information for sending important communications, like renewal notices or regulatory updates, to the certificate holder. Failure to report a change of address after this 30-day window could lead to issues like not receiving critical information from the FAA, which can impact the pilot's ability to stay informed about regulations, requirements, or necessary actions regarding their certification.

The other options suggest longer periods than what is permitted, which could potentially lead to a lapse in communication and compliance with FAA regulations. Keeping the notification period relatively short emphasizes the importance of maintaining current and accurate contact information for safety and regulatory compliance.