I don’t think he likes to hear himself at all. I think it’s a combination of catharsis (as I was saying here), and him being used to having to repeat himself a number of times before people will actually get what he’s saying (even though he has a knack for presenting things in the most understandable, layman way).
And while he did repeat a few things, that’s certainly not the reason for the length of the video. I’d say maybe 5 minutes or so was repeat.