Some of the longest I initially thought of were The Brothers Karamazov, Moby Dick, and The Count of Monte Cristo. I did read the entire Bible straight through a couple of years ago, but I don't think that counts since technically it's composed of a bunch of books and we're not counting series.
Anyway, a quick look at Amazon.com says Shogun runs 1210 pages in paperback. So I think that takes the cake for me.