Founders should think about “return on years” alongside return on investment. Say you spend five years building a startup and someone offers you $3M. You could keep going. Maybe another five years gets you to a $10M exit. Maybe it doesn't.. But selling today means you get the money, your time back and another shot at building something new. And if you're 32 years old with $3M in the bank.. you've got a ridiculous amount of optionality. You can invest it or take a year off to…