iPhoto and Aperture: Minimum and maximum book lengths
This document describes the minimum and maximum length of bound books that you can order through iPhoto and Aperture.
The minimum length for a book you order through iPhoto is 20 pages. You can submit an order with fewer pages, but you will be charged for a 20-page book. Blank pages will be added as needed to bring the total page count to 20.
The maximum number of pages in a book ordered through iPhoto and Aperture is 100 (50 sheets of paper). See iPhoto: Bound Books Limited to 50 Pages for additional information.