Hi Roderick,
You are seriously fast, but I agree, making a plane doesn't take a ton of time. My first Krenov took a weekend. I made one a few months ago and was finished in half a day. Practice makes perfect.
Regarding traditionally morticed planes, these guys back then were seriously fast. I did some calculations last year from archived data and concluded that they made 5-7 planes a day. Very comparable to the Japanese workers. They worked from rough stock, well seasoned split billets of beech. The amount of machines was minimal, only later in the 19th century the specialist machine morticers were introduced. In such circumstances I think it is faster to make a morticed plane.