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WordNet
work time

n. a time period when you are required to work [ant: time off]

Wikipedia
Work Time

Work Time is an album by jazz saxophonist Sonny Rollins, recorded for the Prestige label, featuring performances by Rollins with Ray Bryant, George Morrow and Max Roach.

Usage examples of "work time".

It was work time for predators, with all the little nocturnal rodents out braving death to find a meal.

Ninety percent of my actual work time had been spent cleaning floors, dusting equipment, and trying to look busy.