I spent more than 130 hours over the last 2 months researching and writing this essay (~5…

From Matthew Walker's "Why We Sleep" Is Riddled With Scientific and Factual Errors by Alexey Guzey

I spent more than 130 hours over the last 2 months researching and writing this essay (~5 hours to write the outline; ~60 hours to get to the first draft; ~65 hours to edit and fact-check), which constituted essentially all of my surplus free time over this time period. Continuing at the same pace, it would take me more than 3,000 hours to check the entire book. 3,000 hours is the equivalent of 75 weeks or 1.4 years of full-time work.

I hope that going through one full chapter, rather than cherry-picking stuff from across the book, demonstrated the density of errors in the book.

Update a week after the publication (2019-11-22): in the last week, I spent 20 to 30 more hours editing it.