Depending on your spending and your return on investments, it easily could have in the last 4 years... House prices (on 5:1 leverage) are up >100% THIS YEAR.

Depending on your spending and your return on investments, it easily could have in the last 4 years... House prices (on 5:1 leverage) are up >100% THIS YEAR. The S&P is up ~30%. You need a ~20% return saving ~$300k per year to get >$2M in 4 years. This wasn't terribly difficult to get in the last 4 years. Who knows what the future will bring.