I’m generally fine with 9-5. It gives me enough time to unwind at the end of the day, and I (usually) don’t have to wake up too early. For as much of a night person as I am, I prefer having an earlier start to have more free time afterwards.
Honestly though 12 hour shifts are hell and I even find 8 hour work days just a tad too long. I think a 6 hour hour shift would be just right. maybe from 8pm - 2am something like that. Likely doesn't exist anywhere though haha.
I used to work at an Amazon Warehouse where my hours were 6:30 PM to 5:00 AM for four days a week. It was honestly not a bad job, but I can see how those hours could be stressful. I think that job only lasted about four months before I was terminated, but it was one of the better paying jobs I’ve had. I do prefer the later shifts, but ideally for me, only seven or eight hour work days.I fail to believe that 12 hour shifts for anyone are fully productive. That's just way too long.
I agree about 8 hours. I usually stop focusing at around 3, which thank god I can go home at 4:30. If only 6 hour shifts were more of a norm.