Hours

n. pl.

1.

(Myth.) Goddess of the seasons, or of the hours of the day. Lo! where the rosy-blosomed Hours, Fair Venus' train, appear. - Gray.

Noun	1.	hours - a period of time assigned for work; "they work long hours"
	2.	hours - an indefinite period of time; "they talked for hours"

duty period, shift, work shift, work time