It is a pipeline, not a queue at one door. Once the house is full, several groups are inside at once. A new group can enter each time the slowest scene frees up, so capacity is groups per hour = 3600 ÷ (slowest scene time + walk), not the total walkthrough time. The total cycle time still matters for how long each visitor is inside and how many groups are in the building.

Adding actors to a slow scene. A scene cannot process two groups at once unless it is built for it — two rooms, two routes or a split scare. Adding an actor to a 110-second scene without changing its layout does nothing to capacity. Shortening the slowest scene by 20 seconds does more than shortening any other scene by a minute.

The queue. Arrivals at a Halloween attraction are close to random, not evenly spaced. The page treats them as a Poisson stream and uses the M/D/1 waiting-time formula: wait = ρ ÷ (2μ(1 − ρ)), where μ is the group capacity per hour and ρ is the fraction of capacity you are using. The formula explodes as ρ approaches 1: at 80% utilisation the wait is modest, at 95% it is five times longer. That is why a house that “never turns anyone away” still has a 40-minute line at 9 pm.

What is not modelled. No-shows, group splitting, fast-track tickets, scare actors taking breaks, or the effect of a really good scream holding a group in place longer than scripted. Use it to find the bottleneck and the staffing level, then measure a real night.

Group size and spacing. The gap between groups is set by the bottleneck, but the group size is set by the scenes: a room built for six feels empty with three and unsafe with twelve. Keep the entry interval slightly longer than the bottleneck stage so a slow group never catches the one ahead, and post a host at the bottleneck to hold the next group back if it does. Build in a scare warning and a no-contact route: not every visitor wants to be touched or followed, and a haunted house that ignores that loses half its audience.

Last reviewed: 2026-10-20. A capacity planning estimate for a ticketed attraction; follow your venue's fire limits on how many people may be inside at once.