In your opinion how many Bitcoins would someone need today in order to retire by August 03 2019 or Aug 03 2020?
Assume average North American, requiring $30,000 per year of today's purchasing power, no other debt.
200 BTC.
my reasoning. By that time, Bitcoin could be worth $5000. so that gives you 1 million dollars, or 33 years.
Bitcoin should continue to appreciate though, so you'll actually get more.