The number of pages I read varies immensely depending on WHAT I am reading. Some texts/notes are so dense, getting through 20 pages can take hours if you want to remember anything. Others are so poorly edited that it takes forever to figure out what they're trying to say. Still other classes you can read 100 pages in the same time frame.
Also keep in mind that some schools provide detailed notes for studying while others have you learn from texts.
My school has 25-30 hours of classes per week on average (some weeks it's 35, others it's 22) for the preclinical years. Average day is 6 hours, mostly lectures with the occasional discussion group or other non-lecture activity. During anatomy, 2-3 hours a day (every day) at my school were lab dissections.
Number of classes at a time varies from 4 to 7 or 8 depending on different factors (We have about 20-24 credits per semester, but that is not representative of the total workload of the individual classes). Some classes require travel to other locations (hospital, clinics, etc.).
Clinical rotations are entirely different b/c if you are doing rotations you are probably a third or fourth year and no longer have any classes---just the rotations and their requirements (grand rounds, etc.). They still need to study, but they read up on things they are doing in their rotations and are thus not trying to memorize minutia such as whether hormone X works via the tyrosine kinase or G-prtn pathway and drawing out the Krebs cycle.