Ours was 10 days (including flight in/out) all at WDW. Previously it was 7, and I thought we could stay forever. After 10, I was pretty much ready to go home. It probably didn't help we weren't too fond of our resort, but we just were a bit tired of the hustle/bustle. If we stayed longer, I'm sure we would sandwich in a day or two of resort/pool time.