There is a calculation like this:

If you need 100.000 usd per year you need to multiply it by 25. So 2.5 million. The 25 is that you get 4% return on your investment.

If you are more bulish you multiply by 20. So 2 million usd.

That means your investment of 2.5 million is giving dividents of say 4% a year net after taxes. And you love out of these dividents only.

If you translate this into bitcoin, you need an investment of 2 million usd to be able to live on 100 K

If your bitcoin investment gives you a divident of 4%.

That can be an appreciation of say 8% per year and you eat 4% per year.

That means you need 66 bitcoin at a current price of 30.000.

If you wanted to retire today!

That is how I calculate it.

And that 100.000 usd would be the basket of goods and services you would want to buy today till your retirement.

Your lifestyle basket.