Can’t really give you a quantifiable answer time wise. It really depends on how much time you put in and how good of a developer you already are.

It took me 4 years working full time to get to the point I’m at now. But I also worked Uber, Postmates, and fast food jobs to support my family at night till I got side gig developer work. In my 3rd year things really started to take off. I now have 8 certifications.

Cert tests are only $200-400 a piece to take.