You made good decision to create not too long videos. 10 minutes to 12 minutes are enough for watching a video as if it is longer, it will be harder for us to focus on the video.

You can read this BOOK: 'The Bitcoin History Book 2008-2024'.

It can help you to have more information for your documentary videos.
https://drive.google.com/file/d/1VZsSeyfJLDVL5BDubpus-TMSq-ngCKyd/view?usp=sharing