a time during a regular working period when an employee is not actively productive.

an interval during which a machine is not productive, as during repair, malfunction, maintenance.

noun

break , breathing spell , freedom , free time , halt , interim , interlude , intermission , letup , lull , pause , recess , repose , respite , rest , spare time , spell , stay , suspension , time on one’s hands , time out , time to burn , time to kill