Yes I did. Your comment indicates that you don't understand ceiling. The article is overly simplistic in regards to things like cost of living, inflation, and returns on the savings.

Do you really think you can save 90% of your income and retire after 3 years? This is terrible financial advice and completely ignores functions and changes in spending due to life events. Not to mention, I don't believe that function is legitimate depending on retirement age and current age combinations.

> Do you really think you can save 90% of your income and retire after 3 years?

You certainly can if you make 5 million a year! Which means that absolute income is absolutely relevant.

Hell, in many places you can retire under those conditions if you "only" make $500k a year. The trick is to move to a much lower cost-of-living area after you retire, often abroad. If that kind of thing floats your boat, anyway.

If your income is $100k and you save $90k, spending $10k, after 3 years, you will have saved $270k. With growth, you might have $300k. To support your ongoing $10k annual expenses, you'd only be spending 3% of your portfolio. The math checks out. Of course with taxes, a savings rate of 90% is more than likely to be possible.