Understand that the 90 minute presentation along with a tour of the place can easily turn into 3 hours.
My wife and I used to do lots of these. Sometimes more than one during a vacation. 2 come to mind as good contrasts. We went on one in St Thomas and got all the way to the end and when the sales person sat down with us, he started with the questions that all had "obvious" yes answers. He go to the "If I could show you a way to save money on vacations every year, would you consider buying?". I used the non-obvious answer of no. After a few confirming questions, he understood that we were there for only the prize they offered for sitting through this. He grudgingly got us the prize...I think vouchers for some good restaurants and told us "you know, we do this for a living....if you had no intention of considering buying, you should have told us that up front".
So the next year, on the way through the airport, again in St. Thomas, someone handed us a flier for a time share and said "get a free prize by simply going to this". The prize was good and they offered taxi fare. We had a rental car, so decided to go. The sales guy got us set to start and was walking us from the greeting booth in towards the sales building and asked the question, just like we got at the end last year: "If I could show you a way to save on vacations every year, you'd consider buying, right?". I said "no, we're just here for the prize". He got very angry and said "stay here". He came back with vouchers and taxi fare ($10 all in coins). I forget what he said, but I started to respond that the airport person and the flier touted the prizes, not the time share and we wouldn't have come to this for no prizes. He heard probably none of it as he walked away. We took our $10 in coins and vouchers and had a great week. Instead of 90 minutes, we were out in less than 20.
We've gone all over the world. Vermont, Massachusetts, St. Thomas, Aruba, Hawaii. The absolute soft ball out of all of them were the ones in Aruba. I could stare those guys into submission where everywhere else, I'd think they'd pull out a switchblade.