It's good to know some people are able to find time to enjoy video games in med school, or really, to pursue any other hobby one might enjoy! I definitely think it's about finding the right balance between enjoying yourself and working hard. I'm definitely not the type of person to sit down to a 10 hour marathon of CoD or D3. I find that if I play any longer than 1.5-2 hours in one sitting, I don't enjoy the game as much anymore and need to do something else. The next time I pick it up, it's fresh again and I'm good to go. The longest time I've played at one time was about 3 hours when I was nearing the end of Arkham City and just had to get to the conclusion. Best game I've played since I started gaming again a few months ago.