The last few trips we did 10 nights and usually felt tired enough to leave by the end. That said, I suspect our issue was hitting things too hard at the beginning and never really felt relaxed or caught up. This time we're doing 12 nights and only doing parks for 8 days; the remainder are rest days or at least unplanned days to just unwind and enjoy the time at OKW. I hope this is the sweet spot for us.