Well that record didn't last long "The Belgian dentist Karel Sabbe topped Joe “Stringbean” McConaughy’s overall time [2017] on the Appalachian Trail and now holds the supported thru-hike record...The Appalachian Trail (AT) speed record now stands at 41 days, 7 hours, 39 minutes." If my math is correct thats a consistent 53+mi/day - crazy.