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And those 8 really rich guys definitely work less than 5 days a week already
Most of their "work" consists of meetings that they don't even have to attend and where everyone has to do what they say because they're the boss. That and multi hour "business lunches".
On the harder and more strenuous days it might even include golf!
On golf courses they own, so when they put it in as a "work expense" they get a tax credit and pay themselves back.
They have a 5-minute work week.