For those doubting whether Bill actually writes the reviews you should take a look at: https://www.gatesnotes.com/Books https://www.gatesnotes.com/Books. Of th

For those doubting whether Bill actually writes the reviews you should take a look at: https://www.gatesnotes.com/Books https://www.gatesnotes.com/Books. Of the many books Bill has read, 81/195 have reviews (approximate). Given that he's reading on the order of 50 books a year, let's assume he's been at this for 4 years. That would be about 20 book reviews a year, and each book review on average probably takes him an hour or two to write, get feedback, and revise. (They are not really that involved: https://www.gatesnotes.com/Books/XKCD https://www.gatesnotes.com/Books/XKCD) Seems like it is totally doable, and would not even really take up that much time.