My first I came in at 2:30 am on Christmas eve (had the baby at 10:30 am), stayed that whole day, Christmas day, and left the next morning... I don't think my doctor came in to sign me out on Christmas day... so without a release I had to stay another night... or I would have go home then.
My second, I came in at 1:30 pm, and then had her at 6:00 approx... stayed that night most of the next day, and then left after dinner. Our hospital gives new moms and dads a complimentary fancy dinner after they deliver so the only reason I stayed the second day at all was so my husband and I could eat the dinner.
I hate hanging out in the hospital. In my perfect world I would have the baby, eat a sandwich and some fries, take a nap, and go home. That is because after a little while the nurses kick you out of the plush, cozy, lovely delivery room into a crappy, flourescent lit, cramped "normal" hospital room to recover. In my perfect world... I would never see that room!
I also think that they will probably shoe you out the door sooner with your second baby. You don't have the excuse that "I don't know what I am doing!?" For me all they needed to do was make sure that BF was going ok and that my stitches were healing and then the nurses started "reminding me" that I was "free to go" as soon as I was done with my special dinner. So, just a heads up... they might remind you that you can leave soon too....
Good luck and congrats!
-M.