Submitted the book to the publisher today. I looked back and it was 10 months to the day I started writing it. Took significantly more time than I expected (calendar months but also hours per day). 

It was an interesting process. I learned a lot and it sharpened my thinking on the topic. Would recommend :)

Crypto/web3. Author of Read Write Own

readwriteown.com

One observation: you can pick any sentence from the book and I can tell you where the sentence occurs and in most cases the history of the revisions to that sentence. Which is to say: it takes that many hours (1000+ I think?) to get a book to sufficient quality level. I (naively) didn’t expect that when I started.