Sort YouTube playlist by video length and group by author

⚬ PROBLEM: There are about 100 videos in my "Watch Later" playlist. I keep adding new and deleting old ones, but the number hardly changes.
This gives me a frustration feeling that I was doing useless work. So I wanna watch the shorter videos first, and quickly make the number smaller. Or, sometimes I'd like to choose the longer videos (most likely podcasts) and keep them playing while I was doing housework or exercise at home.
But on Youtube website, I can only sort playlist videos by Time Added, by Video Post date.
I already searched in Chrome webstore, found no available extensions to solve this problem.

⚬ SOLUTION: 1. Automatically calculate the total video length of my playlist when I'm watching 2. Allow me to sort the playlist by video length, by video name, and to cancel any sorting. 3. It'll be perfect if I can arrange or group the videos by video author.

⚬ ALTERNATIVES: Null

⚬ RELEVANCE / SCOPE: Chrome Extension, Youtube Playlist

⚬ "SIDE EFFECTS": Null

⚬ CONTEXT: The time you enjoy wasting was not wasted. So, we need to waste time more effectively.
//
Thank you!

Start by reviewing the Chrome extension's YouTube playlist entry point and how playlist items expose video length, title, and author. Define the behavior for total length, length/name sorting, clearing the sort, and author grouping. Done means these controls work on Watch Later and other YouTube playlists without disrupting existing playlist behavior.