With its 5.6 miles of walking distance it's an average length backcountry hiking trail. There's not much difference in elevation along the backcountry hiking trail, so you get pretty much the same conditions along the whole backcountry hiking trail. This is not a very long backpacking and hiking trail but you should still bring some emergency supplies just in case something happens. Sometimes this backpacking and hiking trail gets really dry, so make sure you check current conditions and fire restrictions with local forest authorities before you head out. You should count on this backcountry walk taking about 5 hours, but of course some folks walk a bit slower and some a bit faster. North Twentymile Trail is a one trailhead hiking and backpacking trail, so you'll be backcountry backpacking it in and back out. The total elevation difference for North Twentymile Trail is 484 feet, and that is lower than average.