For employees in non-exempt positions, Family and Medical Leave Act (FMLA) leave is recorded in the same way as any leave without pay, sick leave, or vacation leave: to the nearest quarter hour. Compensatory time is not counted toward FMLA leave.
For employees in exempt positions, FMLA leave will normally be recorded in whole day increments. The exception is that if the employee takes FMLA leave as a reduced schedule or as intermittent leave, you should record the time hour-for-hour. Please see the appropriate FMLA section of the Absence from Work Policy (PDF) for a full explanation.