Too long. I can't remember exactly but I want to say like over 200. Definitely more than there are seats.
EDIT: Checked last years thread. It was 223.
That is a lot of people. I wonder why they insist on wait listing so many people. Although, I have heard that despite there typically being 40-50 people accepted from the wait list there have been sporadic years when they have taken far fewer and far more than that number.