Twenty-two hours is a serious proposition, and very few writers are asked to read that much of their own prose aloud. J. Kael Weston does exactly that with The Mirror Test, which is the first thing worth knowing about the audiobook and possibly the most revealing.
Self-narration at this scale is not a marketing decision. It signals a text the author was unwilling to hand over, usually because the material is first-hand and the emphasis matters quite as much as the words.
Our catalogue files it under classics and heritage, a broad shelf that gathers work of documentary weight. The response from listeners has been notably strong, and for something of this length that is not a small thing.