Hofstadter's Law: It always takes longer than you expect, even when you take into account Hofstadter's Law.
Corollary: It always takes more repetitions to tell people what you're doing, how you're going to do it, why you're doing it, how much progress you've made, that you finished doing it, etc. even when you take into account the corollary to Hofstadter's Law.
