What's the farthest you've ever walked in a day? For me it was about 20 miles a couple years ago on a backpacking trip in Michigan. My plan was to do about 12-15 miles and camp somewhere and then hike to the car the next morning, but there were still a couple hours of daylight left, so I decided to hike all the way to the car. My legs and body were pretty sore. I was carrying a 30-35 pounds pack.