If you miss your Lightning Lane window at a Disney park, the entry code on your app will technically expire and turn gray, meaning you can no longer scan in. However, Disney cast members often provide a "grace period" of about 15 minutes after the window ends, though this is not a guaranteed policy and is at their discretion. If you miss the window due to a legitimate issue—such as a ride breaking down or a dining reservation running long—you can speak to a Guest Experience Team member (look for the blue umbrellas) who may be able to move your time. If you simply forgot or were late, the pass is generally lost, and you cannot book that same ride again for that day using the Lightning Lane Multi Pass. You would have to use the standby line if you still want to experience the attraction. It is always best to prioritize your Lightning Lane arrivals, as the system is designed to keep a strict flow of guests to maintain low wait times for everyone.