"Allen" wrote in message
...

How long is the break period?


It varies. On a night shift, when a nap would be most beneficial, it could
be several hours.

I used to trade into many night shifts when I was taking college courses.
We'd work together until the traffic died down to practically nothing,
usually about an hour into the shift which began at 10PM. Then one of us
would take a break for about three hours. On my break I'd study, my partner
would usually nap. Before the traffic would pick up, with about an hour
left in the shift, we'd be working together again.