The Disney Genie+ "2-hour rule" (now applicable to the evolved Lightning Lane Multi Pass system in 2026) is the primary constraint that dictates when you can book your next ride. Essentially, you can make a new Lightning Lane selection after one of two conditions is met: either you have tapped into your previous selection at the ride entrance, or 120 minutes have passed since you made that selection. If you book a ride that is more than two hours away—for example, at 9:00 AM you book a 2:00 PM slot for Slinky Dog Dash—the 2-hour rule triggers at 11:00 AM (or two hours after the park officially opens if you booked at 7:00 AM). At that moment, you "unlock" the ability to hold a second reservation simultaneously. This rule is crucial for "stacking" multiple high-demand rides for the evening and ensures that guests cannot monopolize the system by booking an entire day's worth of reservations the moment they wake up.