The backyard ultra timer

There is a kind of ultramarathon race called a backyard ultra . Here's how it works. Every hour a new lap starts. You need to finish the lap within the hour. The person who runs the most laps wins 1 . Each lap is 6.7 km, or 4.1 miles – it is set to this distance so that if you complete 24 laps, i.e stay in the race for 24 hours, you have run 100 miles. I was in the mood for a random little web…