You can find the actual comment posted on youtube. What he said was along the lines of:
“I’m tired of these thousand page bills nobody reads. I want bills that are short. Three pages, that’s something people would read.”
I’ll track down the actual quote (or you can on youtube) and post it. It’s obvious that the operative word was SHORT. Three pages was given as an example of a short bill, not as the upper limit.
Here Cain is borrowing from the Constitution of the Confederate States, which stipulated that each bill could only adress ONE subject, which had to be stated in the title.