How many bitcoin would you need to retire? What investment, if any, would you put them in?
Think about what your asking...How in the world can anyone know where bitcoin will be 1 day from now, 1 month from now or 1 year from now. No one knows the price. Your trying to predict something that isnt predicatable. You can speculate, shit, I can say the sun will come up tomorrow. Odds are in my favor but there is still no guarantee. Only guarantee I know is that we all will perish at some point.
+1 (except the part about all of us perishing; this claim is also unverifiable)
First of all, retirement is a myth. I know, because I've been there. You'll get bored. You still have to work; on relationships, your passions. Stuff doesn't just magically happen in your life because you have money.
Of course, you can sit there and do nothing (like the zen guys), or watch TV (much more likely). But if this is what you want to do, you're killing yourself by waiting. If you're sick of work, my advice would be to stop working *now*, not wait decades. Because if you wait, you'll be very sad when you discover that your whole life has wandered by while you were holding out for a bunch of money. If you take time off, you might discover that you actually want to "work", and then it's not work anymore.
So it's irrelevant how much BTC you have. "Retirement" (aka "freedom") depends more on mental outlook than funds in the bank. Maybe there's a limit to this, but it's quite low. Read Thoreau's Walden, he retired with almost no money.
Second of all, retirement is a myth because of what 1bettor says. The guys at Vanguard or Fidelity or your 401k who peddle "retirement" don't know what's going to happen to money, stocks, etc. Most of them are clueless about the risks from government money printing that could collapse the whole system and destroy everyone's "retirement". I guess all I'm saying is.. I wouldn't bank on it!
Finally, bitcoin is risky. Every day there is a nonzero chance of 51% attack or
nation-state difficulty attack. If you dream otherwise, you are sticking your head in the sand.