We did back to backs in Sept/October 2004. We were allowed to stay on board during the turnaround, but we were kicked out of our stateroom for a short period of time for cleaning. We did laundry, checked out the empty ship (so nice, and we have great pics with no people in them!!) and tried to stay out of the CMs way. We checked in a guest services for #2 at about 1200, got our new KTTW cards and watched a new group of fresh, wide eyed faces come on the ship!
Let me know if you have any other questions. There are a few other folks who have done back to backs too...I know there is a trip report from Nat (I forget her whole Dis name) who just did back to backs this year.