 In its first year, 6- and 12-hour races were offered.In the 1999-2000 event, a 6-day race was offered and reintroduced in 2013-2014.Until 1993 the race was held at Washington High School in Phoenix, after which it was moved to different locations, including a 500-meter certified loop at Nardini Manor in Buckeye, AZ from 2003 until 2010.