We purchased June 1993 at OKW (Then called Disney Vacation Club). Took the tour on site and signed the papers right there. There was room at the resort so we checked in that same day.
Not sure of the timeline, but something like this:
1:00 PM: arrive at Commodore House (where the models were). A guide came out, gave us the tour, and explained the whole program.
About 2:30: Had decided to purchase and signed the papers. Our guide made a reservtion for that same day.
About 4:30: Checked in to a 1-B/R villa. (After going back to our off-site hotel and getting our things)