It's not about copying styles, but rather about doing what actually works. Studies show that student engagement drops off abruptly after 6 minutes. Quoting: "...the median engagement time for videos less than six minutes long was close to 100%–that is, students tended to watch the whole video (although there are significant outliers; see the paper for more complete information). As videos lengthened, however, student engagement dropped off, such that the median engagement time with 9-12 minute videos was ~50% and the median engagement time with 12-40 minute videos was ~20%. In fact, the maximum median engagement time for a video of any length was six minutes. Making videos longer than 6-9 minutes is therefore likely to be wasted effort." https://cft.vanderbilt.edu/guides-sub-pages/effective-educational-videos/ Again, this isn't conventional education. We should keep in mind that most people take online courses in their spare time, for example during their lunch break. If the video is lengthy, they don't even start it.
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