Based on 2013. This event is quite selecting. It tends to be people confident of their ability to climb well who enter. This means you have time to sleep at Langsworthy if you would expect to have it on another 600. But probably less, depending on the weather (we had a westerly, which made the leg out to the coast very fast, but a slower and longer trip to Langsworthy).
Agree with Marcus, a great event.