One of Mark Cuban's best 'Shark Tank' investments works only 5 hours a day

Mark Cuban on His 'Shark Tank' Investments

Mark Cuban likes to call Tower Paddle Boards, a San Diego-based company that sells stand up paddle boards, one of his best "Shark Tank" investments ever.

The company's growth explains why. When Cuban invested $150,000 for 30% of the company in 2011, Tower Paddle Boards just had $260,000 in revenue. This year it expects to hit nearly $10 million in revenue.

But there's another reason that makes the 11-person startup special: Tower Paddle Boards is super efficient, having achieved that growth by working only 5 hours a day.

"Mark's response was positive when I first told him about the 5 hour workday," Tower Paddle Boards CEO Stephan Aarstol tells Business Insider. "He looks at it as, 'OK, it works for your company, but it's not going to work for everybody."

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Mark Cuban business quotes

#1: "I still work hard to know my business. I'm continuously looking for ways to improve all my companies, and I'm always selling. Always."

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#2: "When you've got 10,000 people trying to do the same thing, why would you want to be number 10,001?"

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#3: "Because if you're prepared and you know what it takes, it's not a risk. You just have to figure out how to get there. There is always a way to get there."

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#4: "Go out there and get rich. Get so obnoxiously rich that when that tax bill comes, your first thought will be to choke on how big a check you have to write."

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#5: "​In the past, people used to tell me to shut up a bit. But what I believe is to put out your opinion and let everyone else react. If I'm wrong, I'm wrong."

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#6: "I've learned that it doesn't matter how many times you failed. You only have to be right once. I tried to sell powdered milk. I was an idiot lots of times, and I learned from them all."

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#7: "Work like there is someone working 24 hours a day to take it all away from you."

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#8: "Forget about finding your passion. Instead, focus on finding big problems."

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#9: "It's not about money or connections -- it's the willingness to outwork and outlearn everyone when it comes to your business. And if it fails, you learn from what happened and do a better job next time."

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#10: "What I've learned is that if you really want to be successful at something, you'll find that you put the time in. You won't just ask somebody if it's a good idea, you'll go figure out if it's a good idea."

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Aarstol believes that a shortened workday could motivate employees to work more efficiently. And he is proving to be right through his own company, Tower Paddle Boards, which continues to expand, even after a year of rolling out the 5 hour workday. Last year, it was named the fastest-growing private company in San Diego. Aarstol has even published a book titled "The Five Hour Workday" this month.

"Our productivity just went off the charts. We're still growing and we're still super profitable. There are no downsides," Aarstol says.

Replacing an outdated standard

The inspiration for a 5 hour workday came from Aarstol's own experience. Having run multiple startups over the past 15 years, Aarstol always felt like 8 hour workdays were outdated standards.

He felt like a lot of time was being wasted at work. By forcing people to work less hours, he saw employees getting more creative and efficient, all the while achieving the same level of work.

"Having that constraint on time forces you to come up with creative solutions. Everybody gets that with money — we're just applying that to time," he says.

So last September, after a 3-month trial period, Aarstol rolled out a 5-hour workday fulltime to his company. All 11 employees now come in to work at 8AM every morning and leave by 1PM. And despite shorter store hours, his sales numbers haven't dipped at all, he says.

Aarstol says the best thing about having a 5 hour workday is that it's a great recruitment and retention tool. Employees love it because it allows them to spend more time pursuing other activities. It ends up boosting morale and nurturing more creativity.

"When you talk about knowledge workers, it's about managing energy. How much real work gets done in a day?" he argues.

Aarstol believes his 5 hour workday idea should be applied to more companies across the whole country, which is why he published a book about it. It boosts productivity, helps hire smarter people, and creates a healthier lifestyle, he says.

"This is sort of what kind of life do you want to live question," he says. "It's a choice. We can create a world where we're off by 1PM every day. This shift is needed."

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