[iMark]

I'm been an avid comics fan all my life. I remember "millionaire Bruce Wayne" giving way to "billionaire Bruce Wayne", and idly wondering how long before we'd see the first reference to "trillionaire Bruce Wayne".

It seemed impossibly distant once. Not now.

[stickyricky]

65 years at a 2.5% inflation rate or 15 years at the stock market's historic growth rate of 12%.

[Ballas]

How did you get those answers, I get to about 5billion for the values you provide.

[stickyricky]

185 billion with X% annual compounding interest for Y years.