Somewhere around 35-40 years ago, I was visiting the Kodak Australasian film processing facility in Melbourne. The part I was visiting with a colleague to see how their roller transport machines worked, was their colour print from colour negative section. The Kodachrome film developing section was also there, one of about 7 in the world I believe..
In complete darkness blind employees would join and spool films sent in from customers from various parts of the world onto 1,000 foot reels, identical looking to movie film reels. These were then fed into roller transport machines and came out the other end as fully processed and dry film. I have no idea how many blind employees they had, but it was a very busy facility. The flashes in the exposing department where colour prints were made, was faster than a machine gun firing rate, so to speak. I don't know how many of these machines they had, but it was quite a few. Incredible output, just incredible.
David, I think you are right, the entire world production for a year, would almost certainly be manufactured in a very short time frame.
Mick.