There is no a particular length of courses on BMF. Instructors can make as long as they wish, likewise as they wish. The value that the course wants to bring or add to the users and the students matters the most. However, users should know that the length or how voluminous a course is doesn't really determine the price.
Do you always put importance on the length of a course? What is your favourite between the two?
Do you always put importance on the length of a course? What is your favourite between the two?