The aim of the Three Peaks Challenge is to complete the walk within 12 hours. To make this time, you have to walk on average 2 miles per hour (3.25 km/hr), including breaks. A normal walking speed on flat ground is 3 mph (or 5 km/hr). However, going uphill takes longer, and long stops make a large difference. If you walk fast and don't have too many breaks, you can complete the route in 10 hours. This means averaging almost 2.5 mph (or 4 km/hr).