we have around 20ish timetabled hours & are expected to put in the same amount of study time ... exam revision weeks (known as holidays to most people) are a different matter
At kings we have about 20 timetabled hours and were expected to do an extra 2 or 3 hours a night at least... in practice this rarely happened, and we tended to prepare the minimum amount of work until a month before exams where we worked like beasts.