I haven't done it for myself, but I've walked there to meet a friend in line. For an 8:00 show, the box office told her to get there at 6:00 (they sell an hour before the show), and when she got in line, there were about 15 people in front of her, and they ended up selling 8 tickets. Another time I walked past about 11:30 for a 2:00 show, and there were at least 10 people in line. Seems like you'd need to get in line at least three hours prior to the show in order to be safe.