A timetable will vary between courses and students. Some units have more contact hours than others and, in general, it is expected that for every hour spent in class, the equivalent amount of time should also be spent in private study. You can see the number of contact hours for each unit on the on the Course Handbook for your course. 

You can also use the Plan Your Timetable tool to get an indication of the current timetable associated with each unit.