I will say, too, that that concept is part of why I don't worry about early retirement too much. We'll be fine for at least several years drawing down our cash, and if it starts to look like we're in an "oh shit" situation (our sequence of returns was bad at the front end and we need to salvage it), it only really requires going back to work part time and making just enough to cover a portion of a year's expenses. The equivalent withdrawal rate on just covering our expenses is astronomical from a math standpoint. If you can pull in even $20k in a year, that's $20k you're not drawing down, which also means that $20k that stays in your accounts can continue to grow.