The approximate length of the Appalachian Trail in miles. It's not that the length of the trail is unknown, but rather that the distance changes year to year, based on trail modifications such as switchbacks and reroutes. This year, 2015, according to the Appalachian Trail Conservancy (ATC) Data Book, the AT is 2,189.2 miles. read more
It differs for different people. I think you would have to survey far more than the handful who have answered here for a full understanding. It also depends on how you choose to do it. read more
The Appalachian Trail Conservancy reports that the Appalachian Trail is the longest hiking-only trail in the world. More than 2 million people are said to take a hike on part of the trail at least once each year. The idea of the Appalachian Trail came about in 1921. read more