I blame Iris. 

She's the one who brought the Crooked Road 24-Hour Ultra run to my attention. 

This is not a race. The point of a 24-hour run is--quite simply--to see how far you can run in 24-hours. If you want to walk/run, you can. If you want to run for 2 hours then take a 4-hour break, you can. If you want to run for 20 minutes then bag it and go home, you can do that too. Or, you can give it your all and find out just what you're made of (cue inspiring music).