Fun Quick Poll How big is a life-size dragon? Question Title * 1. How long is an adult dragon? The little cute ones can be as small as 2 feet long usually 30 feet although the famous ones are bigger (Imagine St George slaying one with a sward) A respectable dragon should be at least 300 feet long, about a city block. I would expect something several blocks long. Probably half a mile although hard to tell because it's usually wrapped around mountains and such. Done