I checked a couple of the local glass blowing classes in my area NC (not neon but a glass related experience).
They offer a two day intense beginners class. It takes several months to fill.
They do better offering 1/2 day and 1 day experiences. In other words more frequent, less expensive classes generate more interest & more income.
I did one of their 2 hour $35 demo followed by an optional/additional hands-on experience ($20) with 10 people. Demo 35 x10 = $350 + hands on 20 x 2 = 40. By noon, they earned $390.
They used the intro class to build interest in participation in the 2 day learning experience.
I personnallly would be more willing to invest a shorter amount of time on the experience because When I’m traveling, I’m there to do more than one thing.
I think a neon class would be interesting and have appeal. I think it depends on your region if your guests are willing to invest 2 full days. I believe if property structured, you would have a winner!