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, the system formerly known as Genie Plus (now renamed to Lightning Lane Multi Pass) operates with a specific "grace period" for guests who miss their scheduled arrival window. Generally, the entry scanners at Walt Disney World and Disneyland are programmed to allow guests in up to 5 minutes early or 15 minutes late automatically. If you arrive beyond that 15-minute window, the scanner will turn blue, and you will need to speak with a Cast Member. While they are not obligated to let you in, they often show "Disney Magic" and allow entry if you have a valid excuse, such as a ride breakdown, a late dining reservation, or a transportation delay. If you miss it entirely and cannot enter, that specific Lightning Lane selection is considered "used" or "expired." You cannot re-book the same attraction for that day, as the system typically limits guests to one Lightning Lane entry per ride per day. To avoid losing the value of your pass, it is best to "Modify" your selection in the My Disney Experience app as soon as you realize you won't make the window, allowing you to move your time slot to later in the day without penalty.