I think I've heard until like 10 or 12 or so? But i've also heard that as long as you're quiet and not bothersome you can usually just swim whenever you'd like.
Oh good. Thank you. I was a little worried if we stayed in the parks to see Illuminations or Wishes or something we may not be able to hit the pool for a quick swim when we got back to the hotel. Hopefully it will work out.