Jeff Bezos launched Amazon in 1995. Three years later, he was a billionaire. Within 20 years, he had $50 billion but then it only took another 2.5 years to make his second $50 billion, for a total of $100 billion. And then it only took another seven months to make his third $50 billion, for a total of $150 billion.

Source: www.celebritynetworth.com