Telecom billionaire Carlos Slim thinks we should have a shorter workweek, and he's started with his own major company. He advises a standard three-day workweek with 11-hour workdays and a retirement age of “70 or 75.” He’s not the only renowned businessman and strategist to advocate the calming of our unnecessarily frenetic pace. Slim made the announcement at a recent business conference in Paraguay covered by the Financial Times. “With three workdays a week, we would have more time to relax; for quality of life,” Slim told news agency Paraguay.com. “Having four days [off] would be very important to generate new entertainment activities and other ways of being occupied.” The billionaire chairman recently instituted an optional four-day workweek at Telmex, his company of over 50,000 employees....