An hour? Yes, you can walk to the viewing area and look at the sculpture and buy a postcard in the gift shop in an hour- but you won't know much about Mt Rushmore when you are done. For us it took at least 3 and maybe 4 hours. I highly recommend the walking path around the base of the sculptures, the movie and museum area, the artists studio with the original model of the presidents and the museum. What those men did with what they had to work with is incredible. Would have liked to see the night time lighting but will have to wait till next visit. If you only spend an hour you are short changing yourself.