My mum was in and out within 24 hours with me (cant say same day as i was born at 11pm), same with my brother, she was out immediately, and with my sister she was in for 10 ays but that was due to her having problems, my mum could have been out the same day.
I have heard of someone who had her first baby a few weeks ago, and was in and outta hospital in 3 hours!! according to her DH that included the birth, but i'd like to see how that happened lol