usually to around 4pm, but the shuttles go until everyones had enough riding for the day really.
there is the melon track that is and easier/beginner type track, the east track that was used for state rounds of dh, the national track.
there is also a long descent from the tower. this is more an AM type descend but can be also done on a dh bike. theres a video of it on the home page of the website gvmtbc.com