[dahwolf]

I was not aiming at rich, instead at the concept that time is zero-sum.

You should work hard and also spend the maximum amount with friends. And your parents. Also, exercise, sleep well, and so on. Doing a long list of things very well might lead to exhaustion or one thing coming at the expense of the other things.

Like I said though, do live your 20s hard. Do not live it safely and slowly as if you're middle-aged already. It's a limited time opportunity.