Google Maps estimates the length of Broadway, 13-miles (or 21-kilometers), can be walked in 5 hours. Of course, you want to do more than walk, you’d want to see the sights, maybe pop in for some of the attractions, stop for meals or an ice cream. The good news if you don’t make it the length, and surrender and admit defeat, you can always hop on the subway. It runs the length of the Broadway and will take your back to your lodgings in air conditioned comfort.