(MONEY.CNN) — Mexican billionaire Carlos Slim is suggesting that workers shift to a three-day work week. The catch: He would require 11-hour work days and workers to stay on the job until age 70 or 75.

The Financial Times reported that in a speech at a conference in Paraguay, Slim advocated a radical change in the typical five-day work week.

“People are going to have to work for more years, until they are 70 or 75, and just work three days a week — perhaps 11 hours a day,” the paper quotes him as saying.

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