Good post. I did my first startup straight out of college, which was great for a couple of reasons.

- I was used to living off very little. I didn't develop expensive tastes fueled by a regular paycheck. It helped that I could live at home while bootstrapping. My opportunity cost was getting an entry level job somewhere for decent pay.

- I was used to managing my own time and being disciplined about work schedules. This was helped by attending university in the UK where we had 6 hours' obligatory classes per week or less. The rest was optional lectures and self study time.