In the US one can retire comfortably on $3 million without relying on Social Security. From the downvotes, it's crazy to me that people think a limit of 300 "ordinary people's" retirements is unreasonable.
I really don't think people understand how little difference there is between having $1 billion and $10 billion or even $100 billion. It makes no difference whatsoever to have that much money; they can't enjoy it.