You've missed the point. Nobody can (or did) accurately estimate how long the planning and development would take to get someone on the moon. Half the materi

You've missed the point. Nobody can (or did) accurately estimate how long the planning and development would take to get someone on the moon. Half the materials weren't even invented yet in 1962. Nobody knew that Velcro was flammable in pure oxygen. Sure once all that expensive and unknowable planning and development is done, you can double-click that executable and put a man on the moon.