Well, there is at least one fanfic out that has only two parts out so far 

but is over 258k in size - Careful Destiny [Ranma 1/2].  If he keeps up that 
pace and  goes on for more episodes, say 4 or 5 total, he will have over 
500k worth of stuff, which is about, what, 200 pages?  Sounds like novel 
length to me! :)<<

You're forgeting that we're talking about A4 sized pages here. A paperback novel is one thing. An A4 sized novel is a lot bigger! In the publishing industry, hardcover books use bigger fonts than their paperback counterparts. But that is not the case here. Default settings display a document in 10-12 point type, any smaller and the words will get hard to see. As far as I can tell this is about the size of fonts in paperback books. So, if you printed out a 200-page document with your printer, you'll end up with something a lot bigger than a 200-page paperback novel. Just thought you might like to know.