First off, really consider if the durrance route is the route you want to do. I don't understand why so many people climb this route. I understand that its in the fifty classics book, but I feel that its more of a classic due to the history of the route and not the climbing which I felt was the worst of all the tower routes I've done. What I suggest is give yourself some credit and step up to the cleaner and more difficult routes. There is nowhere else in the US that has better and more mindless gear than the tower. Rooutes such as soler, walt bailey memorial, el cracko diablo on the east face are much cleaner and more direct routes to the summit. However if youre looking for a bunch of 40ft pitches to the top of the tower and crowds of people than the durrance is your best bet!