The Haunts we have visited last varying amounts of time. If it is close to ten minutes, I don't feel the customer is getting what they came for. Our haunt is about 20-25 minutes if the customers don't rush or run. We try to pace the crowd with several points in the house designed to do that.
Our goal is to get it over thirty minutes.
We also have the luxury of being able to grow every year. Our building was so big when we started that we only used one side of the main hallway.
This will be the ninth year we have expanded the haunt by at least one, usually two rooms or hallways. We still have three more years before we need to redesign some of the big/huge rooms into smaller rooms. That will give us a few more years of being able to advertise "more rooms added".
Now, the longest we were ever in a haunt is two hours, forty-five minutes. I don't know how he does it, but that Warfield guy holds the record with us.
Congrats to the Raven's Grin Inn !!!! We have been there three times and enjoyed it each time tremendously.