We have gone in October a few times and in 2010 they ended up extending park hours most nights we were there. Of course you can't count on that, and I'm not sure how often it happens, or if it was just unusually busy that particular week of that year. We have young children so we tend to not mind the early nights, we just don't take the longer breaks during the day and we all get to bed nice and early. During the summer we generally HAVE to break mid day to be able to stay later.