“The 9[am] to 5[pm]” is a common term for one’s regular job, on the basis that normal people start work at 09:00 and finish at 17:00. I’ve worked a few jobs and closest I’ve ever gotten to this is 08:00 to 17:00, which I gather is standard.
Are there real jobs where people actually start at 9 and finish at 5?
I don’t know anyone that has it that strict.
On shift work it is standard to get 6:00 - 14:00, 14:00 - 22:00 and 22:00 - 6:00. And most people I know that have office work usually have some flexible arrangement like you have to work 8h and have to be here for meetings 9:00 - 13:00, so some people arrive at 9 and leave at 5 or you can arrive at 6 and leave at 2…
Other jobs like teachers, doctors… have just completely different schedules each day.