There is no secret recipe, but there are some reasons that speak for short videos:
- Attention span decreases with long videos
- Each completed lesson increases motivation - multiple short videos = more frequent feelings of accomplishment
- It is easier to revise or replace individual lessons when they are broken into shorter videos
- The customer can find individual lessons more quickly and does not have to fast-forward or rewind through a long video
- For marketing purposes, 6 modules and 20 lessons promise more content than 6 modules and 10 lessons - of course, only if you actually add value in terms of content.