> He responded to my October 2022 email, explaining that he had “stopped writing much journalism as of 2015 so as to avoid distractions from a book project that I thought would take an almost unfathomably long time—two years or perhaps even three. Seven years later, I’m doing my best to polish the third draft.”

One encounters this over and over again—even books that successfully get finished and published take far longer than expected, very consistently, and especially any involving research. Books (non-fiction in particular) written as series often also expand from, say, five planned volumes in the forward to the first edition of the first volume, to (say) a dozen.

Reminds me of software estimation.