I agree with the comments about being stretched and pulled. So far my experience at Penn is that it isn't the depth of the material that is so bad, as I have had some classes in undergrad that were much more hairy, but rather the volume of information and how quickly it is thrown at you. I generally study every night during the week, sometimes I'll take Friday's off, and usually I'm in the library on the weekends too. But, after a couple of months, I have learned which classes I can go a bit easier on the studying and which ones I really need to focus. Does that mean I stop when Conan comes on? No, not necessarily, as my life right now is about school my schedule revolves around it - I only quit for the day/evening when I feel I have a good handle on the material. I certainly don't have the free time that I did in undergrad, but I'm surviving and will make it through the wheels.