That is the only thing I like about chat-based communities. It is nice to have a way to catch up, if I want to, from where I left. Cannot be done with modern links aggregators

If chapters are available for the video, yt-dlp has a command line argument that will split the video into different files, one for each chapter. Quoting a reddit comment:

you need ffmpeg.
how to convert to mp3: wiki
split chapters: --split-chapters
example naming files after chapters: -o "chapter:%(section_number)s %(section_title)s.%(ext)s"
available chapter variables:

section_title (string): Title of the chapter
section_number (numeric): Number of the chapter within the file
section_start (numeric): Start time of the chapter in seconds
section_end (numeric): End time of the chapter in seconds

as i recall, i don’t use this myself, it will also keep the original file, which naming depends on the regular -o (use in addition to the -o line with chapter:)

--split-chapters will also work with the timestamps mentioned in the description