I know you didn't direct this question at me, but some surgeons have a limit as to how many hours they'll spend on a surgery. I know Dr. Zachary doesn't like to operate for more than about six hours - and some surgeons are good for more or less than that. So I had my procedures done in two separate surgeries. I was OK with that as I didn't want some tired guy with a knife cutting on me. But yes - some surgeons are willing to operate for several hours. Someone on this or another bariatric site said she was under the knife for eleven hours with Dr. Sauceda. But you're right - his safety record is good, so he's evidently good to go for that long.
btw: Dr. Sauceda was the only one of my consults who said he'd do everything in one day. Dr. Zachary and Dr. Shifrin both said they'd do my LBL in one surgery, and my breast lift and arm lift in a second surgery. I had one other consult in Chicago - the surgeon's name escapes me at the moment, but he was also going to split it into two surgeries (I think he was going to do them in different combinations and/or in a different order than the other two, but still - two surgeries)