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I was going to mention this book. Glad you did it :) Totally changes your perspective towards success.
Is this this book you guys are talking about? https://www.goodreads.com/book/show/368593.The_4_Hour_Workwe... The reviews seem pretty mixed but I might pick it up just to see for myself.
The first part of the book on productivity is still very relevant. There are a few dated parts in the book regarding testing an idea.
I still recommend it to all of my friends who have not read it as the bigger picture message is one that is still very relevant today.