How long does it take to train someone to operate one of those?
3 to six months, most community colleges and engineering schools have training available. Also depends on how good you are at math.
Look up CNC training on your search engine. There are varying levels of proficiency, of course.
There's much more to running a CNC then this stupid article implies. You have to be able to read and understand engineering blueprints too....All of the above is usually contained in an approved Tool and Die apprenticeship. To qualify for a UAW Journeymans card, you have to have served in a qualified journeyman's program which is a minimum of 4 years work experience and schooling. I say 4 years but it's actually hours based - 8000 hours (or provide letters of employment substantiating 8 years working in the trade). With overtime, many guys can get their card in around 3 years as long as they've also taken all the applicable classes.