If I recall correctly, the Toy Story post-view event -- which had around 20 or so days available with two slots each morning -- was filled within about 2 hours of going live. They kept the numbers down for each of those slots (a few hundred at most) and it was open to Gold, Platinum, Platinum Plus and Premier. There are really too many variable to make an apples-to-apples comparison here, but I do not expect the registrations to last more than hour given the demand. Additionally, as with past events, I think this is more of a "shoot first" situation (like Han - the special edition changes never happened) - many APs will sign up and try to figure out the logistics of actually attending later.