nine to five

Short definition from Wiktionary

Adverb

1. 1
   From 9 a.m. to 5 p.m.

Noun

1. 1
   A typical working day.

Adjective

1. 1
   Of a job, beginning at 9 a.m. and ending at 5 p.m., the usual office hours in many countries.

Verb

1. 1
   To work a typical job beginning at 9 a.m. and ending at 5 p.m.