Some very long books for your consideration!

Mason & Dixon by Thomas Pynchon

Through a Glass Darkly by Kathleen Koen

... And Ladies of the Club by Helen Hooven Santmyer

Believing the Lie by Elizabeth George

An Instance of the Fingerpost by Ian Pears

(and don't miss Jen Campbell's great video on his "Arcadia":

   • Video  )

Underworld by Don DeLillo

The Dying Grass by William Vollmann

Jonathan Strange & Mr. Norrell by Susannah Clarke

The Raj Quartet by Paul Scott