Worst case scenario you get some wanderers reaching a couple miles outside the city or tourist area
Long distance hikers walk 20 miles a day, sleep in a hammock, drink filtered river water, and do it again every day for months, and NK climate isn't that different from the Adirondack portion of the Appalachian trail.
Bicycle backpackers sometimes do 5x that per day, though not in hilly terrain like NK.