Fantastic concept! There is no defined finish line for you to stop. A catcher car starts after 30 minutes of you into the race and you run until it catches you. This car is slow at first (15 kmph) and gradually picks up the pace to 20 kmph during a couple of hours and further tops at 35 kmph. Unique concept, right? But that's not it. It happens in multiple cities throughout the world AT THE SAME TIME. I ran this race in Yilan, Taiwan in 2016 and I am gonna do it this time in Melbourne, Australia. My review/experience from the 2016 race could be find here:
https://multiemotions.wordpress.com/2016/05/12/the-run-wings-for-life-world-run-2016-yilan-taiwan/