I don’t mind playing a full hour before taking a 15 min break, but we more often play 45 min and break for 15.
I’ve played at one venue where the mgmt requested we take our first break at a specific time to help them in taking food orders before they closed the grill. Others wanted us to take no breaks in the final hour. A few places wanted us to play a full hour the first set & then take breaks as we wanted for later.
The bands I’ve been in have tried to accommodate any requests from mgmt. I don’t recall getting any unreasonable requests, but I’ve heard of some from other bands….