..and how good you are investment and taxes.
I think unless you have an after-tax one-time amount in excess of $10 million dollars or more, you're unlikely to live better than a basic upper-middle class lifestyle.
I did a spreadsheet based on investing all of it into tax-free munis (because they're safe, and I can eliminate tax questions) and only have to make rough guestimates on investment yields and inflation.
It isn't hard to outspend your capital and dividends over time, especially if you dump a bunch of money on property.
I put in $200 million in principal, less $25 million invested in real estate and I run out of money in about 30 years, but it does require spending about $5 million a year in cash, which wouldn't be hard to do if a person liked to travel -- a private jet to Europe from NYC could be close to $100k to charter. You could throw out a million per year easily flying private aviation.
Want to own a yacht? Very easy to blow $3 million on a pretty basic motor yacht (Hinckley T55, you can drive it yourself, no crew or certification required) and not hard to see spending $50-70k per year on fuel and maybe another $100k on services for it.
And $25 million doesn't buy you fantasy real estate, either. NYC condos go way past that all the time, and if you factor $25 million buying you more than one property you're getting into pretty ordinary luxury if you divide that by 2-3 unique properties and they would all need maintenance and caretaking.