I spent about the same amount of time, to be honest.. probably about an extra hour a day outside of 'normal working hours' (9-5). Most of that wasn't revision, though, it was just...*vision.
Exam-time is different. For finals in my first degree, I worked most waking hours (like, 9am-10pm) for about six weeks leading up to my exams, giving myself one weekend day off a week, and taking a long lunch in the middle of the working days. In the pre-clinical years of Medicine, I did pretty much the same, over about two months leading up to my exams. Then in clinical years, it was much harder to motivate myself to work like that, so I just did what I could, when I could be bothered. I kept that up for most of final year (an hour of MCQs here, a practice of an OSCE station there, some note-writing elsewhere..), and then spent two solid weeks of study leave before finals squirrelled away in Cumbria just revising/doing OSCE practice and only emerging to eat.