The US has about 150 million workers. How long did it take them to learn to do what they do? I'm interested in this because of the analogous question for AI. Running an AI on a job and training it to do the job are different costs. In a recent post I found that when an AI can do a task, running it is far cheaper than paying a human, while training it looks about as expensive as the human's wages over the time they took to learn. So it is at least conceivable that we end up in a world where we ca