The best way to measure a big fat zero is to start with a blank slate and leave it at that. You will be far more productive in the long run. oh, and you may actually have time to do some of the things you should be doing anyways. oh, and you may even have a better chance of making it to the other end of your teetering teeny tiny office tower. oh, and you may even be the envy of all your coworkers in the process.