Because you can only use Genie+ access once per attraction, you do need to modify it if you wish to change your arrival time. If you miss your window and did not successfully cancel or modify it, you will not be able to make another reservation for that attraction.

In 2026, if you miss your Lightning Lane window (formerly part of Genie+), you generally lose your chance to use that specific pass for that ride. The system typically allows a 15-minute grace period past your return time, but once that expires, the pass will disappear from your "My Day" tab in the app. You cannot book the same ride again for that day, as the "one-time-per-ride" rule still applies. However, all is not lost—if your delay was caused by a factor out of your control, such as another ride breaking down while you were on it or a sudden weather-related closure, you can kindly explain the situation to a Cast Member at the ride's entrance or visit a Blue Umbrella (Guest Experience Team) station. They have the discretion to "blue-pass" you or manually adjust your window. For 2026 travelers, the "pro-tip" is to modify your reservation before it expires if you see you're going to be late, which allows you to save the booking for a later time without losing your daily slot.