This format is much easier than the mountain, trail, road, and even canal path 100s that I've run over the years. You don't need to worry about weather, carrying gear and calories around, or running in the dark by headlamp. All your gear, clothing, drinks, and calories are accessible at any time. There's always a nearby spot to sit or lie down. You can blast music at whatever volume necessary. All things considered, I think 48 hours is generous for 100 treadmill miles. It's also a great way for someone to earn