5 CFR 550.1406: Use of accrued compensatory time off.

(a) An employee must request permission from his or her supervisor to schedule the use of his or her accrued compensatory time off in accordance with agency-established policies and procedures.

(b) Compensatory time off may be used when the employee is granted time off from his or her scheduled tour of duty established for leave purposes. An employee must use earned compensatory time off under this subpart in increments of one-tenth of an hour (6 minutes) or one-quarter of an hour (15 minutes). Agencies must charge compensatory time off in the chronological order in which it was earned, with compensatory time off earned first being charged first.