a salary that guarantees $1 million a year post-tax

to keep the mind-boggling numbers in perspective:

you’re paid $1 million/year post-tax, like you said.

and say you have no expenses to speak of - you take all your meals in the Google cafeteria, take the Google shuttle to work, and live with your parents or in some other form of housing that doesn’t cost you anything. this means you can put that entire $1 million/year into a savings account.

even in that contrived scenario, you would need to work 1000 years to accumulate one billion dollars.

at which point, you would have 1/145th of Sergey Brin’s current wealth. if you wanted to match it, you would need to work 145,000 years.