Shark Tank star Kevin O’Leary says you’re ‘stupid’ if you work this many hours per day

The celebrity investor once touted workaholism, but has since changed his tune.

Investor and Shark Tank star Kevin O’Leary once declared that to succeed in business you must be willing to grind out 25 hour work days. He has since walked back on that idea, calling it, in his own words, “sheer stupidity.”