Dogwatch

(n.) A half watch; a watch of two hours, of which there are two, the first dogwatch from 4 to 6 o'clock, p. m., and the second dogwatch from 6 to 8 o'clock, p. m.

Thesaurus Entries

anchor watch, bit, day shift, full time, graveyard shift, half time, lobster trick, night shift, overtime, part time, relay, shift, split schedule, split shift, stint, sunrise watch, swing shift, time, tour, tour of duty, trick, turn, turn of work, watch, work shift