Not too easy. Not too difficult.
It's very fun and enjoyable. Each of the assignments can be redone and the online course Greger teaches tells you what exactly you got wrong and where in the textbook you can study that particular topic.
The highlights of this course were learning a new language, of course! I learned much about the Spanish language as well as the culture in the process.
Hours per week:
Advice for students:
You should definitely study every day, even in little ways. That way the material sticks with you.