BrianS listed:
"Elizabeth Moon's The Speed of Dark lists at 370, but that's a paperback and it reads pretty fast"
I'm going to throw in:
Peter Geye's Wintering (320 pages)
So let's go with those. If you plan to participate in some fashion (or not, why police that right?) vote in the comments* for your top three in ranked order.
I'll tabulate the results on Thursday. Hopefully, we won't have a tie, but if we do I'll just use random.org to choose from those.