The 100k starts at 6 am and the 50k & Marathon starts at 6:45 am. There is a 15hr limit (9 PM). The course is an out and back 3.88 miles each way for the 100k and 50k. There are 4 loops for 50k and 8 loops for 100k. The Marathon course is a Certified BQ Course its 6.55 up 6.55 back 2 loops for the Marathon. Pacers are only allowed for 100k runners after the 50k mark! very fast course! The 100k/50k and Marathon courses are USATF Certified.