If you get a stamp from 4-5 and it's broken down during that entire time preriod, you can't go back at like 6 and use your stamp. Even if the ride breaks down, or if there is like a thunderstorm or something the entire hour, you can't come back later and use your stamp. I think that's how it works anyhow, Can someone with a little more knowledge of this subject confirm this (or tell me if I'm completely wrong, in which case I apologize in advance..)