Double your time

The most valuable thing you have is time. Sometimes it don´t look like this is true, but when you starting running a business I recognize you need some more time. Ok you have just 24 hours a day like for everybody else, but you can use this time wise. I am an area sells manager and I spent a lot of time in my car. During driving for hour I have started to listen to CDs about business to double my time. During my workout in the gym I do the same thing so I win some extra hours. How do you double your time?