Deep work by Cal Newport.
It helped me learn how to be vastly more productive in the same amount of effort and time.
How seriously would you recommend it?
https://www.calnewport.com/blog/2012/11/21/knowledge-workers...
"Last week I introduced the deep work philosophy" in this blog post links to the one above: https://www.calnewport.com/blog/2012/11/27/some-notes-on-dee...
Plus, if you spread out the reading over a few days/weeks, you can apply what you've learned throughout the day as you read along.
Work on one thing without distractions for big blocks of time, 1-4 hours. You will make great progress by concentrating on one thing at a time.
....there you have it
My takeaway was that I wasn’t crazy for only answering email every few hours and helped quell the anxiety that people “needed” my response.