From the parking lot your visit to Bent's Old Fort starts with a 1/2-mile roundtrip hike to the reconstructed fort. There is not a lot of shade on the walk to the Fort, so definitely pack water, sunscreen, and a hat!
The paved pathway is 1/4 of a mile (1,275 feet) in length one way, with benches in several places.
Source: U.S. Department of the Interior, National Park Service