ive heard it said in previous posts that once you get above 10 floors, the chances of dying are very strong. Although how you land will determine how quick/painful your death is. If you land on your head, it's basically game over. If you land on your feet, it might not be as instant from that height and you might experience pain before blacking out. Also, youd want to land on a hard surface (concrete) and not have something break yr fall because that could change what happens. Depending if someone catches you in the act and alerts the authorities immediately, yr odds are passing quick are pretty good. But im only basing that on what I have read here, no real first hand account/experience.
Best of luck what you do.