“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?
Lunch breaks, in the US, aren’t mandatory. Your state may require it but the US labor laws do not.
Found this out when Subway was making my 16 year old niece work 10 hour shifts with no lunch break.
Somehow this does not surprise me. Seems in line with everything else in the US