Here's how long it took 21 of the world's richest entrepreneurs to go from millionaires to billionaires

One million and one billion are two very different numbers.

A million seconds, for instance, is 12 days. A billion seconds is 31 years. 

Yet Facebook founder Mark Zuckerberg was able to go from millionaire to billionaire status in just one year at the age of 23 - making him the youngest self-made billionaire in history. 

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To see how long it took some of the other richest entrepreneurs to grow their fortunes from six zeros to nine, check out this infographic from UK-based direct funding company and web platform Fleximize:

fleximize.com

Click here for the interactive version of the graphic.