On the technical side of the answer to that problem, I *COULDN'T* use all 5300, because it would change all the " ' " to "?" and cut off the last line. When I made it 5250, it was fine. Make sure when you save it, it's still in a good formatt.
As for the literary merits of hitting that point, I don't know for sure (Being that my writing skills are only at the "P" level), but if you really have 5300 characters of things to say, I'd go for it, but definitely don't add fluff, and don't repeat yourself.
Jade~