By "lengthening" I mean unnecessarily taking too much time to express a subject. I am looking for a single word that will replace lengthen. I am sure there is a colloquial term for this; at least in high school world.
The need arose when I finished an online video course about how to write unit tests in React using Jest which was supposed to be highly technical.
It took 4 hours of course time (8 hours of real time). During the course, the instructor talked about Shakespeare, Mark Twain, and other irrelevant subjects. Even with relevant topics, the instructor unnecessarily lengthened them.
At the end, the learning platform reasonably asked for my feedback. I would say the whole course could easily be made at most in 30 minutes. So, I want to give one-liner feedback:
The instructor "lengthened" it too much
Thank you all..