Tech wife how to program

My wife is pursuing Ph.D is in media and communications. She has almost zero experience in programming. She wants to explore the opportunity of changing career to tech (as apparently there is very little academics roles for PhD and they are all low paid and competitive). How long does it take for her to learn and how realistic it is to aim for top companies such as @google? She is on her first year of PhD so she probably has time to learn until graduation.

Also, if someone can share similar experience from ppl u know, it would be great.