30m. Interesting route as the line gets more vauge the higher you get. The gear in there, you just need to look for it as well. Follow the obvious groove in the arete (obvious when you've located the climb) and climb this till it gets difficult and break out across the slab [left] with some hard climbing. Follow this "rib" up to the top.
n.b. The belay isn't the greatest to take some time to build something worthwhile.