The formula I used to reach my Number:
Lifestyle of $250k annually, beginning in 2015 requires $7million
$250k marked for inflation (add 38%), multiplied by 20 = roughly $7million
(250k + 95k) x 20 = 6.9million
I didn't multiply by 40 because I feel that at the age of 35, I will still probably want to work, but will work only because I choose to. My work will also be a safety hatch (in case I should have multiplied by 40).