To sum it up that book:
To work fewer hours per week in the long term, set up a business, and figure out how to automate, speed up and delegate as much of the work as possible. Imagine a few cool inspiration inducing anecdotes alluding to a cool lifestyle. Read elsewhere for the bit about how to set up a successful business in the first place, or the details of how to automate and delegate effectively.
There you go - 200 or so pages you don't need to read :-)