@animegal - In a postgraduate program like a Master of Arts the course work is much more difficult than undergraduate work and students find themselves restricted to taking fewer courses at a time, but with a much heavier work load.
Often the school will recommend that you give yourself at least 10 to 15 hours of week to focus on one class, and this is only taking into consideration basic assignments and reading. When it comes to final papers time management can become an issue.
I think anyone considering becoming a postgraduate student should be fully dedicated to his or her program. There is a huge amount of reading and research involved and it requires a fully committed student.