Love this quote from the Mark Cuban book;

I had to kick myself in the ass and recommit to getting up early, staying up late and consuming everything I possibly could to get an edge. I had to commit to making the effort to be as productive as I possibly could. It meant making sure that every hour of the day that I could contact a customer was selling time, and when customers were sleeping, 

I was doing things that prepared me to make more sales and to make my company better. And finally, I had to make sure I wasn’t lying to myself about how hard I was working. It would have been easy to judge effort by how many hours a day passed while I was at work. That’s the worst way to measure effort. Effort is measured by setting goals and getting results. What did I need to do to close this account? What did I need to do to win this segment of business? What did I need to do to understand this technology or that business better than anyone? What did I need to do to find an edge? Where does that edge come from, and how was I going to get there? The one requirement for success in our business lives is effort. Either you make the commitment to get results or you don’t.
How to Win at the Sport of Business: If I Can Do It, You Can Do It by Mark Cuban