For me, the optimal length is 18-22 minutes. 20 minutes in average. Lower than that, I am annoyed because I have to click the "Next" button or whatever too many

For me, the optimal length is 18-22 minutes. 20 minutes in average. Lower than that, I am annoyed because I have to click the "Next" button or whatever too many times. Longer than that, I feel pressure. I feel that I have such a long video to watch! I keep planning to get that chunk out of my day, and keep postponing it. I know I am grown-up enough and should not be feeling this, but this is what happens. This was personal. But there are factual plus points in favor of smaller chunks: 1. The quizzes at the end of each chunk. The smaller the chunk is, the easier you feel to learn facts and other stuff, the more retention you have before you get the opportunity to face questions and cement a concept. 2. You can very quickly find it later. Rather than having to click through a 100 minute video, you can quickly read the titles of sections on a web-page. 3. When sections are short, the instructor remains focused and to-the-point as well. This is what I want from most instructors. Sure, I would love to hear Yann LeCun blabber about AI for 60 minutes unscripted, but I don't want that from a rando MSFT engineer teaching a tool.