Hmm I can't see how that'd work with anything that's worth reading except novels.
For the past few years all I've been reading were information packed books from fields of psychology, business, advertising and self help.
Now, the point of reading those books is to implement different ideas and that's simply not possible if you listen to the whole thing in 30 minutes because it's not humanly possible to retain what you just read/heard.
If I learned anything is that reading a book without pausing at crucial ideas and consciously implementing them will simply leave you with that nice feeling while having understandings fade away in less than a week.