We are going to pass. Disney time is too "precious" to get sucked into a longer than promised presentation. I politely stayed on the phone last week after booking a Hilton reservation to listen to something and the salesperson got downright nasty when I declined the offer. I was not prepared for that and it gave me a taste for what it might be like in person!
That person gets a small referral fee if you agree to attend the presentation.
As I posted earlier, I've been to many timeshare presentation (primarily when I was younger, as a medium to reduce cost). A typical presentation requires you to commute to the venue, in which you'll send several moments "waiting" for your host. The receptionist will engage in light conversation with you while you wait -- in actuality, he or she is feeling you out to see which host you're the best match for. Once you sit down with your host, you'll be offered either light refreshments or a full meal. While you're eating, your host will begin engaging in light conversation with you. Again, they use the information you're providing to design your presentation. Once you're finished eating, the presentation will "finally" begin; at this point, typically an hour or more has passed since your arrival -- but they will insist this time does not legally count against the 90-minute clock. Your host will spend the next 60-90 minutes giving the presentation. Note that they will insist that any questions or requests that you had -- maybe you asked about a kids' program, or maybe you asked to tour a specific portion of the resort, or maybe you simply had to go to the bathroom -- does not count against the 90-minute clock.
At this point, your host will begin discussing money. If you do not agree to buy, you will speak with at least two, and most likely three or four (sometime more) representatives - each displaying their charm and applying an increasingly level of pressure. As
@mckennarose pointed out, they will keep you there until you stand your ground with a firm "no," and tell them you've completed the 90-minutes. Still, it will take visits and a lot of pressure from several reps before this happens - at least 30-minutes, but it will seem like more. If you don't demand the presentation end, they will keep you there as long as possible. I believe Florida law requires your host to let you leave once you make the demand (I know Hawaii and Nevada laws do), but note that it often takes several requests. I recall one host at Aulani in Hawaii telling me "sure, you can leave as soon as you agree to buy." (Because Aulani is so far away from Waikiki, at one time Disney offered large incentive packages to visitors who agreed in Waikiki to make the trek to Aulani; because of these large incentives, Disney itself retorted to high pressured sales tactics.)
Once your host has dismissed you, the receptionist will check you out. This process will often exceed 15 minutes, even if you're the only person remaining. Once he or she has checked you out, you will have completed your obligations and/or received your gifts. By this point, typically around 3 hours - often more - have passed since your arrival. And if you relied on them for transportation? Odds are, they'll make you wait. Aulani made us wait over 3 hours for our return shuttle to Waikiki. But of course, had we became Disney owners, they would've comp'd our meals while we waited (in reality, we would've been put on the next shuttle). If you did not have to wait for their transportation, typically close to four hours will have passed once you make it back to your room. At this point, you're so exhausted from the day's events that you need a nap.
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As I mentioned, we still occasionally go to timeshare presentations in Hawaii. The offers represent HUGE savings. For example, a recent offer for the Hilton Hawaiian Village (HHV) included six nights, with breakfast for two adults and two kids, parking and an economy car rental... for $799. At the HHV, the resort fee ($40) and parking ($50) alone are $90 per day, and breakfast is $120 ($40 per adult, $20 per child; rates with breakfast are generally more than $120 than the lowest rates). And, if you express interest in the program, they'll sell you a deeply discounted package that allows you to "try out" the timeshare for a week. Ultimately, one presentation saves you thousands of dollars. But for a couple hundred at Disney? I'll pass - I value my time more. (OK, I'm rambling.)