The key to reading a book a week is to understand that you shouldn't be reading non-fiction word for word. Non-fiction is (usually) made to be understood, not read! Here's how to do that, summarised from this HBR article:
While you read, take note of what questions you have. Where do you agree/disagree? This trick (combined with the 5 steps above) will ensure that you remember more than you otherwise might have, because you're now actively engaging with the text.
The last important idea is that non-fiction is a conversation between thinkers, expressed through other books. Reading more, and quickly, helps you learn where each book fits into the larger narrative of ideas, and allows you to become faster with each subsequent book you read.
Summarising helps you remember what you've learnt from a book. A book summary organises a book's information in your brain, and exists as a useful reference, post-reading, instead of re-reading the book.
Having a quick index of summaries also makes it easier to cross-reference ideas across different books. Most people get too lost in the weeds while reading, and are unable to connect the arguments of one book to the ideas of another one 3 books later.
Keeping a searchable index of books makes it possible to do so.
The beauty of this ability to remember what you've read is that you can finish a book in a week, while maintaining higher comprehension of the ideas and concepts expressed therein.
I'm a dude who reads.
This site was written in Go to help me with my book reviews, and you may find the source code here.
The header font is Cormorant Garamond and the body font is Clear Sans.