I agree with the using them between 10-2. If you get to the park at rope drop, then you will be able to get on lots of rides before 10, then you can use your 3 and if you want go back and take a nap or break. As soon as you scan your band at your last fast pass, you can go into the app and schedule your next one and so on and so on. A tip if it comes up afternoon, you can actually go back and choose a time instead and you will get more accurate fast passes. We found we could get good ones for Magic kingdom especially.