[jwpeddle]

Hofstadter's Law: It always takes longer than you expect, even when you take into account Hofstadter's Law.

[dj-wonk]

According to DJ Wonk's Law (shamelessly self-named), when discussing software estimation, it is inevitable (only a matter of time) that someone will mention Hofstadter's Law.

[mpg33]

Yes but wouldn't it at least close the gap to make the time estimate a little more realistic?

[flurdy]

True, and Parkinson's Law will ensure it will take at least that time