I think you miss the point, it's not strictly about "it take 20 hour for an child to drive a car" and more of it can do this without external help. From your ex

I think you miss the point, it's not strictly about "it take 20 hour for an child to drive a car" and more of it can do this without external help. From your example, It's about how the child knows to stop at red light when he was never told that you have to stop at red light.