"Dude, quit as soon as you can barely afford to. Life's too short to make someone else who is already rich even richer with your precious time. Quit while your brain and body are still functional. I'm serious."
Oh, I know you are... but I have 4 kids and a wife to feed while I'm figuring out my next steps ;) Plus, I have a pretty fun gig right now. My problem is that I always want to accomplish about 20x more than I possibly have time for.