For TRON Lightcycle / Run at the Magic Kingdom, your "lateness" depends on whether you are using a Virtual Line entry or an Individual Lightning Lane (ILL). If you have a Virtual Line spot (Boarding Group), Disney is generally quite strict; the app states you must arrive within one hour of your group being called. However, cast members often grant a "grace period" of about 15 minutes. If you arrive several hours late, you will likely be turned away unless you have a valid excuse, such as a dining reservation or a ride breakdown elsewhere. For the paid Individual Lightning Lane, the system is slightly more automated, but the same "15-minute" unspoken rule usually applies. In 2026, as the ride remains high-demand, they are less lenient than they are for older attractions. If you know you are going to be late due to an official Disney conflict (like a late-running table service meal), keep your receipt or show the "blue umbrella" guest services team your app; they are usually happy to move your window. For the best experience, aim to be at the entrance 5 minutes before your window opens to ensure you maximize your "User" experience on the grid.