Depends on the future price of bitcoins obviously, but I think that everything bigger than 100 btc should be fine.
So you guess I may be fine? I sometimes worry I can't continue my lifestyle when I retire. You know, that I don't have enough money for the relaxing years of my life!
BitcoinMillionaire: You did NOT say how many coins you have. I would presume that if you are proclaiming to be a bitcoin millionnaire then currently you have at least 2,000 BTC..... which should be enough in the coming years, and it should be enough to begin to live off of them now. .and to withdraw NO more than 5% per year.