Improved DurationCostFunction #2
Description
There are several block types which are currently not taken into account when calculating the time it takes to complete a Courseware section in DurationCostFunction.
This includes the PDF block (its word count has to be calculated somehow) and audio- and video-related blocks (the duration of the media has to be retrieved).
Before implementing this, it should be decided whether the development of the DurationCostFunction should continue at all (since it is pedagogically not very reasonable to recommend learning units simply because they are completed quickly).