induction hospital stay-how long??

so I have gestational diabetes & will be induced at 39 weeks on 12/21 if I don't go into labor myself before then. my dr said they'll start the process at 9pm on the 21st and let me labor for 24hrs max and if nothing happens then they start talking about c-section. sooo,  if I end up needing a c-section would they make me stay for 72 hours from the 22nd? or would they count back from the 21st? trying to figure out if we'll for sure be home for Christmas or if we could possibly still be in the hospital.