This particular course is run by FutureLearn (www.futurelearn.com), which is an offshoot of the UK Open University. It's what is known as a MOOC - or Massive Open On-line Course. These are quite popular at the moment and many Universities, and other institutions, are involved in providing them. The subject matter of these courses varies tremendously.
I have just completed week 2 of this 3 week course. They state that they expect you to take 3 hours per week, or more if you follow up the additional material they provide. So it's not to hard to fit in the required time. I am finding it very interesting, and quite thought provoking, as it delves into the military politics and social aspects of the period.
Stupidly I showed my wife a course they were also advertising on King Richard III. Now I am signed up for that as well, she didn't want to do this by herself! Life is getting very busy.
Anyway - I recommend getting MOOCed. Try it. Let me know what you are doing. Maybe I'll see you in class.