[LeoSolaris]

Start something first. When you have earned enough over a year to live on, give your two weeks notice.

For me, I am aiming for 80% of my salary in a year's profit from my business before I leave the day job.

Never expect your job to educate you or expand your abilities. While it's nice when you have that opportunity, it isn't common and usually requires showing that you already are capable of doing the new stuff. It is not your employer's job to improve your skillset. You're hired for the skills you have and your ability to learn their practices.