The concept is pretty simple: One loop of 6,66km. 60 minute limit per loop. The first loop starts at 7h00 AM. The second one at 8h00. Etc... You must complete the loop before the next start. You must be at the start line on time. Otherwise, you become spectator and access in Hell will be forbidden. Whoever completes a loop after all the others have quit or have been eliminated will bring home the Key (the one who unlock's the Gates of Hell).