5 CFR §550.1401

This subpart contains OPM regulations implementing 5 U.S.C. 5550b, which establishes a separate type of compensatory time off. Subject to the conditions specified in this subpart, an employee is entitled to earn, on an hour-for-hour basis, compensatory time off for time in a travel status away from the employee's official duty station when the travel time is not otherwise compensable.