https://www.vox.com/the-goods/2018/11/2/18053824/elon-musk-death-mars-spacex-kara-swisher-interview > The good news is you can’t afford to do the same. > Elon Musk has been talking about his plans to colonize Mars for years, most notably at a September 2016 conference in Mexico, at which he said that he would need just 40 to 100 years to create a self-sustaining civilization of 1 million people there.