Mind-The-Ducks 12-Hour is an ultramarathon run on a circular course for 12 continuous hours. The goal is simple--run as many laps/miles as you can in 12 hours.
The scoring is also simple. One lap is 1.01203 long. One lap counts for 1.01203 miles, two laps - 2.02406 miles, ten laps - 10.1203 miles and so on. Whoever completes most laps/miles is the winner of the race. Only full laps count. No partial laps.