There is upside and downside to signing an agreement to “work over 10 hours on nights”.
The upside is that the company cannot force you to work longer than 10 hours per shift.
The downside is that you can kiss goodbye to any and all your overtime you might otherwise be able to pick up working the night shift, that is, “four hours worked between 10pm and 4am”.
Thus, if you start a shift at 00:01 hours, then technically you are “early doors” rather than “nights”.
A company wouldn’t get much take-up of such shift starts though - as you would not get the “night premium” either that way.
It is down to the individual as to what makes an “optimum shift” for them.
I prefer starts no earlier than 7pm for example, and finishes ideally that get me home in time to do the school run.
Working 15 hour shifts at Tescos whilst on agency - had me starting at 18:00, and finishing with the nodding dog at 09:00 - which I would NOT call “An optimum shift”. I found from experience that the “ideal shift” for me pulling 15 hours - was actually a 14:00-15:30 start!
Trouble is there, that you don’t get the night premium for that either, as some agencies pay a “right through” rate, based on the start time.
A FULL time job with those hours - is a different matter however. I used to lean towards such hours when I was working at RM a decade ago.
“Basic Duty” might be say, 18:30-04:06, with me coming in at 15:30 and booking three hours docket on the front of that. If I got stuck on the M25 or M1 or M40 because of a serious accident one night, I might not get back until Breakfast time, but because there was no “10 hour rule” to hamper me, - instead of calling someone in to pick me up, unpaid - I would simply drive back normally once the RTA had been cleared, and book the extra hours as overtime, maybe completing a 14-15 hour shift by the time I was done.
In 2002 I grossed 42k for working hours like this at RM at the time. 2002 was my highest earning year ever, as well.
These days, I’m barely doing 10k less than that… But then again, I don’g get overtime any longer, so it’s swings and roundabouts as always. 