nine-to-five job
nine-to-five job {n. phr.}
A typical office job that starts at 9 A.M. and ends at 5 P.M. with a one-hour lunch break at 12 noon or 1 P.M.
We professors are not too well paid but I could never get used to a nine-to-five job.
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Source: A Dictionary of American Idioms