How Much is a Million, and Other Big Numbers

"How much is a Million?
How much is a Billion?
How much is a Trillion?"

Gives comparisons that (may) help the reader's mind around those really, really big numbers. For example,

"A million seconds is 13 days.
A billion seconds is 31 years.
A trillion seconds is 31,688 years."

(Note: This page uses the American "billion," which is 1 followed by nine zeros. The European "billion" is 1 followed by 12 zeros. There are similar differences between American and European standards of naming the bigger numbers, too.)