Say there was a website which listed all of the written books, letters etc... found from the time in approximately chronological order (as close as we could get), how big would that website be.
Also, has it all been digitized? Have we even translated everything? How many times have we found new written text in the last few decades/centuries?
Are you interested in the epigraphic record as well - that is, inscriptions on various materials, for various purposes, or just in literary works and letters? That would cover a lot of material as well.
I started a thread a while back with a very similar question: http://www.reddit.com/r/AskHistorians/comments/2w2vvj/its_often_lamented_that_the_great_majority_of/