Serpent wrote:one "book" is 50 pages, one "movie" 90 mins (roughly).
L2-only textbooks count, you can also count some internet etc but many don't bother.
audio is less straightforward, so this infographic was made last year:
Green is the original concept, yellow and orange a bit further removed, red not allowed.
If you do listening-reading you have to choose one language
We've lost the image!