10 days
Just forget about the videos you want to summarize and (optionally) eat a cheeseburger instead. I came up with this solution myself. It works instantly, with 0 dependencies, and has a 0% fail rate. It is my intellectual property though, so please pay me $19.99 per day until you get tired of not summarizing youtube videos. Cheeseburgers are not included, btw.
I have a few issues to report