Wheeler,
I had my DaVinci surgery on a Friday morning and stayed in the hospital until Monday morning. I think the extra time was a result of some extra work he did on some bowel adhesions, and wanting to make sure the digestive system was working OK. So, as 142 said above, averages can be misleading, and every case is unique.
I've never envied the guys who go home 24 hours after DaVinci surgery, though. The insurance companies may like that, but the hospital seems to me the best place for initial recovery. I felt so much more ready to go home Monday than I would have on the day after surgery! The idea of a speedy discharge sounds attractive, but a restful couple of days in a hospital setting was right for me, even though I'm not fond of hospital settings.