You can get someone in as a software tester basically off the street which is comparable to a jr baker. AKA limited part of the process that makes developers more efficient. We also use collage interns to do some development tasks, which might take 6 months of focused training from scratch so 1-2 years training from tester to Jr dev seems about right.

Thus there is a path for someone to be useful their first week with zero training to gradually become a senior developer in less than 10 years.

PS: Just remembered, my dad actually went from cabinetry to developer and his background was a few years of a philosophy degree. Granted, this was ~40 years ago, but the jump is not as hard as you might think.