Duty hours are 7:00am 7:00pm and 7:00pm 7:00am.

Eight (8) of these hours must be yard duty hours to help us maintain student safety.

The act may or may not have been performed during duty hours.

He tried to escape during duty hours by scaling a chain link fence at the edge of the island.

Similarly, 5% of human factor accidents occurred to pilots who had been on duty for 13 or more hours, where only 1% of pilot duty hours occur during that time.