I was up and walking after 24 hours. I didn't have DD with me (as she needs to go to the Children's for surgery) so I didn't 'need' to get up. I felt a bit sore and breathless for the first few days, but I never had any issues. I was off all pain medication after 44 hours.
On day 5 we moved into Ronald McDonald House, were we had to go up 2 flights of stairs and that was no problem.
DD was in RCH NICU for 4 weeks, and many times in that period DH and I had races up the stairs. She was in a small SCN for a few weeks after that and we were having stair races every day.