The problem with doing this is it's a tedious listen. Imagine a bot reading to you kind of like you hear on Twitch with text to speech donations. It's really annoying.
That being said, one of the easiest ways is Windows now has text to speech, at least my Win 7 does. I have to imagine that there's text to speech apps for android and ios these days that would accomplish the same thing but i'm not certain.
I have a really hard time finding torrents for audiobooks i like in the non-fiction genre, one place you can try is AudioBookBay at http://abbproxy.com/
If anyone knows or has invites to private sites for a good selection of non fiction audiobooks i myself would love to know.