Comment by geor9e

This one sounds a bit robotic and takes ~4 hours per book on my M1 laptop, so I'll keep looking. For now, I'm happy my current method - EPUBReader browser extension, which opens .epub as an HTML page in Microsoft Edge browser, which has a "Read Aloud" button set to the Stephan natural voice at 1.6 speed. Best sounding voice I've ever heard, speaks fast, clear, crisp, with natural inflections to the sentences, and if I want to jump to somewhere I just left click the text at that spot. And it's instant - no conversions. Downside is I have to stay in bluetooth range of my laptop, so I'm still looking for a good phone based method. Google Play Books works okay, but gets buggy at 1.6 speed.