Re: How many bitcoins do I need to retire in 20 years?

I would estimate 10-20 BTC

Seems very low to me. Not sure from which country you are from but I would assume you need at least 1-2btc a month at current prices to cover all living expenses, pay taxes, enjoy leisure, etc. You would need these 10-20 per year just to live.
Of course the bitcoin price will rise and you will need less coins,but the living expenses are rising alsim

It depends on the bitcoin price. I reckon the bitcoin price will double every two years, so that price will be $500,000 each then.

I don't think that is possible, we don't know whether bitcoin will exist that long or not and even if it survives its very difficult to touch that price.

Even on $4000 seems unrealistic and its hard for bitcoin to reach that price soon. How much more in $500k then its very very imposible to happen. As other said we wouldnt even know if bitcoin would last to for so long that it could rich some moon amount.

I used to think the bitcoin price will double every year for the next 20 years, but with the current slow development, it seems very unlikely.