Say I plan to hop to HS, and at 7am I book a 5pm Slinky. As I refresh the app during the day, will available times for Slinky keep showing? If an earlier time pops up, will I be able to see it so (theoretically) I could switch to it? I think I've seen people say that there's no "modify" function for the G+ passes, you have to cancel and rebook. Does the 120 min rule apply if you just want to cancel and rebook? In other words, would I have to do it at 11, 1, or 3?