“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?
This is correct, lots of places that were 9 to 5 would give people a lunch half hour or a lunch hour that would technically be on the clock. When lunch hours became mandatory employers went well fuck that and made it so you didn’t get paid for your lunch. Most people don’t realize off the top of their heads but 8 to 5 is actually nine hours.