Entrepreneurs

5 'Shark Tank' judges share their best time-management tips

The judges on ABC'S "Shark Tank" have a lot going on.

In addition to the filming the show, the entrepreneurs are juggling countless companies, investments and spending time with their families.

To stay on top of it all, the Sharks have become experts at managing their time. Here are five Sharks' favorite ways to get things done.

Mark Cuban: Do everything you can via email

Mark Cuban
Tyler Golden | ABC | Getty Images
Mark Cuban

Billionaire investor Mark Cuban says he takes care of as many interactions as possible through email, instead of wasting time in long meetings or on drawn out phone calls.

The method allows him to be more productive.

"Love it. Live on it. Saves me hours and hours every day. No meetings. No phone calls. All because of email. I set my schedule," he says in an interview with Thrive Global. "No meetings or phone calls unless I'm picking up a check. Everything is email."

Robert Herjavec: Plan your calendar a year in advance

Robert Herjavec at Iconic in Seattle on April 5, 2016.
David A. Grogan | CNBC
Robert Herjavec at Iconic in Seattle on April 5, 2016.

For Herjavec Group founder and CEO Robert Herjavec, his calendar is key.

He tries to plan his entire year in advance and then stick to it.

Herjavec tells Entrepreneur that when his kids were younger, he would meet with their school counselors at the beginning of the year and add every event he could to his schedule.

"Because of that, I never missed a swim meet. I never missed a school play. I never missed anything," he says.

He suggests that everyone use their calendars more rigorously.

"Set aside time to do a full calendar review six months or a year out to make sure you are on track with your yearly goals as well," he tells Fortune.

Kevin O'Leary: Prioritize with Post-it notes

Business investor and television personality Kevin O'Leary
Amanda Edwards | WireImage | Getty Images
Business investor and television personality Kevin O'Leary

On top of managing his companies O'Leary Financial Group and O'Shares Investments, Kevin O'Leary even found time to run for public office in Canada. So how does he get it all done? Writing on Post-its every day.

A "sticky note, you know, just a yellow piece of paper," says O'Leary in a recent Facebook live. He recommends writing down three time-consuming things you need to get done on a Post-it at the end of each day, and not starting any new tasks until the three items are taken care of.

"It makes you immensely productive. Try it. It's a fantastic trick. You don't need any technology for that. You just write it down on a piece of paper," he says.

Barbara Corcoran: Live by to-do lists

Barbara Corcoran
Source: ABC
Barbara Corcoran

Although Barbara Corcoran sold her real estate empire in 2001, she is busy building new authority as an entrepreneur, investor and author. To manage her time wisely, Corcoran relies on to-do lists.

She rates things on the list in order of importance: A, B and C. The things that go under A are her top priorities, and are to-do's that will make money for her businesses, she explains in Inc.

"It helps me avoid feeling like a jack­rabbit jumping from one task to another and not completing the important things first," she tells the publication.

And the lists are on paper. She has tried digital and wasn't a fan.

"The 'delete' button never gives me the satisfaction that I get from crossing off an item on paper," she says.

Daymond John: Remind yourself of your goals

Daymond John
David A. Grogan | CNBC
Daymond John

Five days a week, Daymond John reads a list of his goals before he goes to bed at night and again in the morning when he wakes up, according to Business Insider. He says setting goals helped him build his first company, FUBU, into a multi-billion dollar business.

"I would write something down, think about it, visualize it and work my way toward it," Business Insider quotes from John's book "The Power of Broke."

His goals relate to health, family and his businesses, and the entrepreneur says it is crucial that every goal be specific and include a deadline with steps to achieve it.

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Disclaimer: CNBC owns the exclusive off-network cable rights to "Shark Tank."