I picked up Four Thousand Weeks to listen to on Audible.

I first heard of the book on Cal Newport’s appearance on the Tim Ferriss Show (Episode 568). Ferriss then posted a chapter of the book on his blog. From the introduction on the post it seemed like he was deeply affected by it. It did not affect me that deeply.
I subscribed to his newsletter, The Imperfectionist and read a few of his blog posts. I found that I could not focus on what he was trying to say. Hence, I decided to pick his audiobook.
His website gives a succinctly good summary of the book. What he adds in the book is evidence and anecdotes to back up the claim.
The average human lifespan is absurdly, insultingly brief.
If you live to be 80, you’ll have had about 4,000 weeks. But that’s no reason for despair.
Confronting our radical finitude – and how little control we really have – is the key to a fulfilling and meaningfully productive life.
If you need practical takeaways from the book, I’d suggest watching Nathan Lozeron’s summary of the book on his YouTube channel, Productivity Game which also has a nice 1-page PDF summary.
On listening I found a lot of overlap with concepts from Cal Newport’s Slow Productivity, the Gita’s exhortation to follow process and not be swayed by outcomes, and Warren Buffet’s advice to his pilot.