Take on 75km (47 miles) with a 24 hour target and 2,235m of ascent, the Silver Challenge is shown with silver lines on our route schematic. Not to be underestimated, this route follows the easiest and flattest routes between approximately 8 refreshment checkpoints, but still covers a huge mileage. During the initial overnight leg, you can chose to join a led group walking with a guide, or navigate yourself. During the daytime, you’ll navigate yourself.