I'd think of it as a two-step process. The second step is just make safe investments in, for example, mutual funds. Your money should double in value in abou

I'd think of it as a two-step process. The second step is just make safe investments in, for example, mutual funds. Your money should double in value in about 10 years -- maybe less, maybe more. So if you can get to $300 million, then another 20 years of basic compounding returns could easily convert that into 1,200,000,000. But yeah, to reach that kind of 9-figure starting position, you'd probably need to invest in a wide variety of long-shot gambles, and then hope that you win more than you lose.