We were just at Disneyland last week, and used several fast passes past the times, sometimes you just get stuck in a line of a broken ride...or a ride has an extra long line...you just never know, we were Never questioned, as long as it was past the start time, they never once said anything, always smiled and sent us right in. And I have three small boys, we used fast passes constantly! We got our roger rabbit pass, then one other, usually space mountain, or buzz lightyear, then ran over to CA and got Grizzly river rapids and Soarin or one of the rides there... and then would head back to disneyland and use them and pick up two more and then use the California adv ones then get another one....if we stuck to a system, it worked out very well, and spent very little time in line, and more time on rides and the time in between was deciding which fast passes to get next and pin trading along the way and not just winding through the mazes of a long line that they would get bored with very quick and start fussing and crabbing at each other! I think we may of only used a couple in the actual hour window. Even if we would of tried, you just never know what will hold you up, we got stuck on the train, and that held us up, the roger rabbit ride shut down and took us a long time to get on, the shuttle buses got you back a little late......They have to know that things happen and you may not be able to get back during a 1 hour window.