Hi,
The amount of study required seemed to vary from person to person on my course.
When I was on the Integrated course I used to have class from 8:45 - 4pm and then did about 3-4hrs study in the evening. Then I'd do a few hours over the weekend. That just about kept me on top of the work.
However, some of the other people on the course (who were rather brighter than me) were able to get away with an hour a night and still breeze through the exams.
Its all worthwhile in the long run!