“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?
Factory jobs are 6-14 and 14-22 (and 22-6 if there’s a rush), and office jobs usually 7-15, including a 30-min break. Then there’s the service sector, depending on when the shop opens…