Hmmmm, a popular fiction book proclaimed the answer to that is “24”. LOL. That was a fun book to read and I still carry a towel around all day on every May 25.
However, getting serious…..
The author has pointed out more reasons why we know beyond a doubt that the universe as well as the earth was not just a cosmic random evolving, but was intelligent creation by a holy God.
I am sure daniel1212 is already fully aware of this. For the benefit of others reading this thread, if you are interested in a very detailed study of the biblical creation model of origin, I suggest Scientific Creationism by Henry Morris. 
Actually the answer is 42
He was also is a overall good concise Bible commentator. "Days of Praise"