Like many things, the minute we're not paid for it is when we stop doing it. Our total joint operation is a well-oiled machine - pt in OR 1, pt rolling into OR 2 to get prepped and draped, next pt for OR 1 getting their spinal in pre-op. Surgeon has his PAs close in OR 1 and goes straight to OR 2 where the pt is ready. Pt in OR1 goes to PACU, and the nurse goes straight to pre-op to pick up the next pt who has just finished getting their SAB +/- blocks. It helps that the surgeon's average time on a joint is about 15-20 minutes and has zero interest in downtime.
Now, for surgeons who are slow and take too much time between cases, this doesn't work, and we won't do it. I document "pt prepped and draped - waiting for surgeon" whenever we're ready to go and the surgeon isn't in the room.