Elon Musk is currently the world's richest billionaire, with $306.5 billion to his name. Even if you were to make $100 million per year, it would still take you 3,065 years to amass that level of wealth.
To break it down even further, that means earning roughly $11,415 an hour.
And there are "evil" billionaires. The billionaires mentioned here are from the western world. In some countries (i.e. UAE) billionaires treat their workers like slaves. I admire Elon Musk very much for what he achieved, it's almost superhuman but contribute to society by paying taxes!