When I talked to my friend today I found that he has in his college the same course that I have. I wanted to ask him about the length(?) of his course (since our course is two two weeks and I wanted to know if his is the same) and then I found myself in hilarious situation, therefore I'd like to know what's the acceptabble way to ask the correct question in the context:
I know that "course" also means a period of time. Then I asked:
a) "What's the course of your course?"
But I had more choices:
b) "How long (+time?) is your course?
c) How long your course takes?
d) What's the period of your course?
Which of the choices, is the correct, if any?