Hmmm well some are longer than others.
I've calculated that it's approximately 1,600 characters per page.
The shortest story is 3 pages, so 4,800 characters AND the longest story is about 42 pages so around 76,800 characters.
I'm trying to prototype with an UNO but I can purchase any type and number of Arduinos if required, the payment isn't coming out of my broke pocket thankfully.