Earlier quoted context omitted.
I'm sorry to be the buzz-kill, but that's simply not true.
This attitude is a disease in our culture. I challenge you to name a single task an able-bodied human with a sound mind cannot be taught to do and explain why.
A task that would not be possible in even a 2 year time limit would be to get a random able-bodied human to contribute to a cryptographic standard. Some stuff is difficult and takes years and years to learn and understand. Taking those years and years is actually physically impossible for a large number of people who would simply break down if forced into it.