8hrs this year and about 9.5hr next year...
As Greg said, show up. There was something like 300 people on the wait list but that honestly doesn't mean chit, at least up to this point.
400 signed up and paid on the day of registration (sold out in like 5 minutes). only 320 showed that originally registered. 60 others that were either on the wait list or just showed up at the track were still able to register and compete in the event. At $400 a pop, they aint turning anyone away with cash in hand!