>>10429494The average competitive marathon runner can run at 10 miles per hour, If you ran at 10 miles per hour for 24 hours you will have burnt 33,600 calories which is like 8 lbs of fat.if you ran as fast as usain bolt 27.8mph (obviously not sustainable but this could be an upper limit) at 140 calories a mile that would be 3892 calories per hour, Multiply that by 24 hours and you get 93,408 calories in a day, divide by 9 calories per gram of your fat and you get 10,379 grams of weight, convert grams to pounds and you get 22.9 lbs max.
