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Just thinking quickly about it, the longest books for me would be:
Stephen King's The Stand Uncut at 1,153
Pandora's Star by by Peter F. Hamilton at 1,144
Stephen King's It at 1,138
In actuality, Pandora's Star is just the first half of the story, with Hamilton's Judas Unchained being the second book that completes the story, and that one clocks in at 1,024 pages. A whopping 2,168 pages for the complete story! I'm glad I read them, because they contained some really cool sci-fi ideas and one of the better nasty alien races I have run across, but man, that stuff took me forever to finish.
I am just finishing up Wolfe's You Can't Go Home Again, which is just a bit under 700, but I must say, I am ready to read some shorter books or short stories for a nice break!
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“It takes considerable knowledge just to realize the extent of your own ignorance.” ― Thomas Sowell