From Longman Dictionary of Contemporary Englishlunch/dinner hourlunch/dinner hourthe period in the middle of the day when people stop work for a meal I usually do the crossword in my lunch hour. → hour
Examples from the Corpus
lunch/dinner hour• So, by the late 1980s, the services resembled the kitchen of a fast-food restaurant during a busy lunch hour.• It may be no more than a little park near work or a church that you stop by during lunch hour.• Walk for fifteen minutes each lunch hour.• During her lunch hour she shopped, deliberately avoiding the part of town in which Giles's office was situated.• Friday: the long lunch hour at the York.• I sat through lunch hour staring at a poster of a crab louse magnified to monstrous proportions. 