hours - a period of time assigned for work; "they work long hours"

workday, working day - the amount of time that a worker must work for an agreed daily wage; "they work an 8-hour day"

go, spell, tour, turn - a time for working (after which you will be relieved by someone else); "it's my go"; "a spell of work"

trick - a period of work or duty

watch - a period of time (4 or 2 hours) during which some of a ship's crew are on duty

day shift - the work shift during the day (as 8 a.m. to 4 p.m.)

evening shift, swing shift - the work shift during the evening (as 4 p.m. to midnight)

graveyard shift, night shift - the work shift during the night (as midnight to 8 a.m.)

split shift - a working shift divided into two periods of time with several hours in between