work-hour
or work·hour, working hour
[ wurk-ouuh r, -ou-er ]
/ ˈwɜrkˌaʊər, -ˌaʊ ər /
noun
any of the hours of a day during which work is done, as in an office, usually between 9 a.m. and 5 p.m.
Origin of work-hour
First recorded in 1840–50