IF there is an attendant at the fast pass kiosk ask them if there is a problem if you are late returning. We have missed our window and been told that it was okay, we could go on through. Make sure you ask though, this way, if it looks like you'll have a conflict you know you can return at your leisure after eating. The only thing is that as a previous poster said, the earlier you go through the more animals you see. We went through before 10 AM and got to see the lions, went back later like in an hour or so and they haf already moved inside. This was in October when the temps were moderate too.