More ARC gathered data. For the past 2 years, we have been gathering results and ranking racers. We have almost 200 races in the database. Here's a couple snapshots.
6 and 12 hour races were by far the most common -accounting for over half of all the races.
For all aggregate of all the races, the average winning time was about 85% of the total race length and the winning time percentage ranged from 72% to almost 100%.