Use the 80/20 rule: 80 percent of the results come from 20 percent of the time and effort.Working incredibly long days but still feeling like you have work to do is a sign that you are doing something wrong.Ask these two questions, inspired by economist Pareto, to get back on track, Ferris writes: What 20% of sources are causing 80% of my problems and unhappiness?Which 20% of sources are resulti