When I received this book, and saw all the white space on the pages, I thought: Wow! It won't take long to read! Uh, wrong. It took several days to read, and I will go back and take even longer the second, third, fourth, etc. time through.
These little koans each deserve at least a day of cogitating. Some, I'm sure, will require longer.
This is a delightful book, and when you're doubled up with laughter at some of the sayings, it will dawn on you how utterly true they are, and how utterly true they are for you at that time and in that place.
Highly recommend Zen Master Raven.