It is a general belief that the more you work (in hours) the more money you make. This is how we think of the jobs that we do, the contracts that we choose and what we get paid. If we plot this thinking it looks like this:
This was valid during the industrial age. The more hours an employee worked, the more hours the factory was open, the more widgets it produced, the more widgets the company sold, the more money it made. So as a result, the more hours you worked, the more money you got paid. If you wanted more money, you could do overtime. The problem is that we are still on the same mindset.
Now that we are living in the information age, we need to change our thinking. When it comes to information, knowledge and creativity, the reality is that you will have a few hours that are very productive and spend the rest being busy. This has resulted in a graph that looks like this:
Based on this thinking, it's only a few hours every day that produce great results, and then we plateau. We just keep busy so no-one asks us what we are working on and assigns us more work. So even if we spend endless hours at work, it's very probable that we won't get much more in terms of quality or compensation.
This has helped me realise that what we need to focus on is measuring the output of someone's work and not the time they spend on it. When we measure the output and its quality, then the time becomes irrelevant. If you want to make more money, you need better output at less time spent.