8 time management tips you should know about from self-made billionaires

Time management is one of the things that poses a great challenge for everyone. Most times, 24 hours just don’t seem to be enough.

Here are 8 management tips form self-made billionaires across the globe:

1. Richard Branson, Founder, Virgin Group: "One of my favorite tricks is to conduct most of my meetings standing up. I find it to be a much quicker way of getting down to business, making a decision, and sealing the deal. When given the opportunity, I often like to take things a step further--literally, with a walking meeting."

2. Warren Buffett, American business magnate, investor, and philanthropist: "The difference between successful people and very successful people is that very successful people say 'no' to almost everything."

3. Nathan Blecharczyk, co-founder, Airbnb: "I try to fill my calendar in reverse, from the end-of-day to earlier; I try to reserve the morning for doing 'real work.' I find I can focus more in the morning, whereas it's harder to get focused after having been bombarded by meetings, so I try to save meetings for later in the day."

4. Mike Cannon-Brookes, co-founder, Atlassian: "Do one thing at once. Stop multitasking!"

5. Mark Cuban, owner of the Dallas Mavericks, Magnolia Pictures, and Landmark Theatres: "Never do meetings unless someone is writing a check."

READ: The 25 CEOs who perform best in the world

6. Andrew Mason, co-founder and former CEO, Groupon: "Rather than give a specific piece of advice (I have tons, but none of it is rocket science), I'll just say that actually being disciplined about adopting these habits is, in my experience, a huge differentiator of successful people ... If I was building a character in a business video game and I had 10 character points to distribute, I'd put three of them into intelligence and seven of them into self-discipline."

7. Dustin Moskovitz, co-founder of productivity app Asana and Facebook: "Pick one day a week that you and your team can focus on getting individual work done without any interruptions like meetings. At Asana, we have No Meeting Wednesdays established to encourage flow and productivity across the company."

8. Mark Pincus, co-founder and CEO, Zynga: "If you want to build great products, devote more than 50 percent of your work hours to product. Don't accept [any engagements] if you can't justify them as benefiting your users or your company."