I direct you to
the retire early home page.
Check out the "4% withdrawal" study link on that page. I believe that study says you need to accumulate enough so that you can live off of 4% of the amount. So, if you can live on $40,000 per year, you will need to accumulate $1 million. I believe the 4% withdrawal amount assumes that you have 80% in a stock index and 20% in bonds.
The creator of that page retired when he was 38 and had a $400,000 net worth.
One cool thing about being a poker player is that you should be able to retire much sooner than a non-poker player. If you can live off of $40,000 per year and can make $20K per year playing poker, then theoretically you can retire when you accumulate $500,000.
Early retirement can be achieved, but you will need to make a plan as soon as possible and have the discipline to stick to it. Good luck.