From the Gulf Coast to the highest point in Florida at Britton Hill near Paxton. 50+ miles. You can start at any point on the Gulf Coast and run any route that is all on public property & legal access for all.
In 2014 Justin Simoni, the “Long Ranger”, bicycled to all 58 of Colorado’s 14,000’ summits, climbed them, then biked to the next in 34+ days. In 2017 he upped the standard and in 60 straight days did the “Highest Hundred” (summits in CO) in the same self-powered, self-supported style. And his background is an artist, not an athlete.
https://www.verzasca.net/articles/176_Via.Alta.della.Verzasca
Many people come from far away to take this 6-day (60km) hike, one of the wildest hikes you will find in Switzerland. Via Alta is a difficult hike, not for beginners. It goes along the ridge separating Val Verzasca from Valle Leventina, offering extraordinary views throughout the whole hike. You can sleep in the mountain huts along the way, the reservations are recommended in the high season.
The Green Rock Trail is a 14.5 mile route (29 miles out-and-back with over 4,000 ft of vert) that connects Rockwoods Range, Greensfelder County Park, and Rockwoods Reservation. This long connector is one of the oldest in the area, dedicated on May 11, 1968 by the Greater St. Louis Area Council of the Boy Scouts of America. The trail showcases several features of Ozark terrain (steep slopes, winding ridge tops, narrow hollows) all less than a hour's drive from downtown STL.