There isn't one set textbook that everyone reads so there is some variation between students but here are some of the ones I tend to use: Pathology - Robbins and Cotran Pathological Basis of disease Pharmacology - Rang and Dale's pharmacology Immunobiology - Cellular and molecular immunology by Abbas (we are focusing on immunology this year so I don't know any microbiology-specific textbooks)
There is a huge range between each week! Most of my time during the term is spent in contact hours (lectures, practicals and tutorials) and the rest of my self-study time is mainly spent on tutorial work (essays, worksheets etc). So I would say each day can range from 0-10hrs of work (10 being the absolute most, which rarely happens, and this usually involves a lot of contact hours). Weekends can usually be quite free if you manage your time wisely and I usually do revision during the vacation so that's why I can get free time to enjoy my time while I'm at Oxford. But hopefully you can get that there isn't a minimum amount of time that you need to spend studying as a medical student and I really enjoy the long vacations at Oxford to do some light revision every day to keep on top of everything.
There is a lot of variation but personally I like the following: Pharmacology - Rang and Dale's Pharmacology Physiology - Pocock Human Physiology or Guyton and Hall Textbook of Medical Physiology Neuroscience - Neuroscience by Purves Pathology - Robbins and Cotran Pathologic Basis of Disease For a good summary the Oxford Handbook of Medical Sciences is a nice little revision resource
