In the article I wrote that there was no guarantee the book would be a success. The reason for that is that I didn't have any validation upfront whether the book is a good and viable product idea or not. I started work on it long before I joined the 30x500 class, and how the book came about is not exactly in the spirit of it, as it takes a whole different approach on finding audiences for products and all that.

The total time that went into the book is hard to put a number on. I'd say at least three months of dedicated writing, testing out theories in practice, editing, proof-reading and building up marketing momentum around it went into the book.