This depends on the person, the trail, the weather and numerous other variables. I usually figure 2 miles per hour when planning a trip. My actual average is about 2.5 to 2.7 miles per hour when counting only walking time. I've found that measuring only the time you are walking is the best way to guestimate the distance you have covered. This should be adjusted for the experience of the hiker. Remember to include breaks. Including breaks, I'd figure averaging from 1.7 to 2.0 miles per hour. For a trail mileage chart, check out a Mileage Table at: www.isleroyale.info/IRmiles.htm.