Perhaps this should be called "single-page" rather than one page. It's 6,000 words and paginates to 27 pages when pasted into Word without modification (13.5 point font.)

I decided to time myself reading it, I would say quite carefully. It took 15 minutes of slow, careful reading. (I did not stop to do exercises).

It's really excellent however, and if you have 15 minutes, go ahead and read it. It's very approachable.