I watched Christian from Zettelkasten.de taking notes from a book. He’s a professional note-taker, and it still took him two hours to take four notes in the first video - it does take forever to make good permanent notes.
An example of someone taking notes in public to model the process. Also an example of the time it takes to make notes.
Has Dan Allosso (@danallosso) done something along these lines as an example on his YouTube channel?