How long should course description be?

I want to get some opinions about the subject, how long the descriptions of courses should be. Do you prefer very short descriptions with one or two sentence or do you like a little bit longer descriptions like I did with the German courses.

I would like to hear opinions.

As we can see the curriculum before buying the course, I think it is not very important to explain a lot at the course description. Writings’ and conversations’ topics inform student about offered course enough. But for that, a person should open course details. So the description have to attract interest on the course, and after reading description a person opens course details and decide does he like this course or not.