The planning fallacy is that people think they can plan.
If you’re doing something broadly similar to a class of previous projects, just ask how long they took — the answer may sound hideously long.
This answer is true. Deal with it.
When you are young, hungry, and single, you have
* huge amounts of free time (more swings at the ball)
* less to lose (more swings)
* enthusiasm (more likely to swing)
* sublimated sex drive (more likely to swing to stand out from your peers)