I'm a college athlete who won't be applying to med school for a few years but I am trying to start a spread sheet of my activity hours to make the process easier. It is easy to calculate the hours I spend in practice but my team often travels to tournaments and I don't know how to calculate tournament hours. For example, for one tournament we drove 8 hours to get there on a Friday, played Saturday and Sunday and drove back Monday. In total I spent 74 hours at the tournament, but I was on the field playing for about 12 of these hours. How should I calculate this?