I personally tend tend to listen to audiobooks on 1.5x or 1.75x which is around the same speed as I would probably read it so unless you read way faster than that as most the time 2x speed sounds like a chipmunk it’ll probably be at a similar speed of finishing a book.
I will say it really does depend on the narrator on whether I can listen to the audiobook. Some narrators are terrible and I couldn’t listen to their voice for the entire book. Stephen Fry however is an excellent narrator so I’ve listened to a few books just because he’s the narrator.
I disagree with some of the other comments in this thread about not having to concentrate nearly as much, I find at least in the beginning of the story as you’re learning the new characters and new landscapes you need a fair amount of concentration. So I wouldn’t start a new book if I was working on a challenging project at work otherwise I wouldn’t take anything in and would have to restart.