Design Theory
Each attraction inside a Disney theme park has a maximum number of guests that attraction can handle in a given operating day. For example, a ride-through attraction like the Haunted Mansion may be able to carry 2,000 guests per operating hour. During a 12-hour operating day, 24,000 guests can experience this attraction. Similarly, a live theatrical show with a theatre capacity of 3,000 guests that has five shows during the day has a capacity of 15,000 guests. When Fastpass is installed on the attraction, a certain number of those seats (in the theatre, on the ride vehicles, etc.) are set aside. The remainder are made available on a "stand-by" basis to other park guests.
At the beginning of the operating day, the enabled attraction's wait is pre-set at a given time (for example, 45 minutes). The number of Fastpasses available is evenly divided into time intervals (usually five minutes, but sometimes three minutes). As guests obtain Fastpasses for the attraction, time intervals are depleted, moving the return time to later in the day. For an average attraction, the Fastpass wait will generally stay near this initial pre-set time.
In the case of very popular attractions, such as Splash Mountain or other major thrill rides, time intervals are depleted quickly, resulting in longer virtual waits. Sometimes, all the time intervals will be depleted early in the day, at which point Fastpasses are no longer obtainable for the given attraction during that day.
Read more about this topic: Disney's Fastpass
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