I don't know your reading tastes but the Flowers of the Field (672 pages) and a Flower thats Free (sequel, 780? pages) are excellent novels about two women during both WWI and WWII. Very good writing, and pretty long!I read them while I was with my ex doing his field work in Kenya. He bored trees and I read! And read!
Of course almost anything by Pat Conroy, although not series, is wonderful and long (but did not like South of Broad). Prince of Tides, the Great Santini, Lords of Discipline.
I really enjoyed Reversible Errors (well almost everything) by Scott Turow, and this, about a lawyer trying to get a death penalty client off, and the prosectutor and police involved, is really good and over 500 pages.
I am not much of a Stephen King fan but Bag of Bones (also over 500 pages) is superb. I listened to it for a whole ski season of commuting back and forth to the ski condo and it was really really good. Just never got into his others but they are long!
Sarum, and it's follow-up The Forest..................wonderful, intelligent, and also educational.........spans the history of humans from very early on to present day, but giving each character a name,pesonality,etc....linking them to events in history, and weaving loooong family lines thru history to see how they are connected, all the while explaining historic events and their significance on the folks in the story.......I find it extremely interesting, and the description of historic events much easier to retain than dates/names
Oooh, forgot Sarum! That is an excellent book! Hadn't heard of the Forest! so thanks for that! Sarum is definitely long, the history of Salisbury (and really of England) through the viewpoint of seveal characters. I really enjoyed that!
"The Chronicles Of Thomas Covenant" by Steven Donaldson is a wonderful series. The first and second trilogy are over a thousand pages combined. The last book in the final trilogy will be out later this year and that one had four books in it. A wonderful fantasy series that is considered one of the classics but not as many people know about. When your done with that he has "The GAP Sequence" and then a nice two book series "Mordant's Need". He is one of my favorite authors.
Never attribute to malice that which is adequately explained by stupidity.
Sharon Kay Penman writes great long books about English history and royalty, including a great 3-book series on Henry II and Eleanor of Aquitaine and their offspring. Her books use real historical events and settings but she sometimes weaves in a fictional characters to carry the story along (no werewolves or time travel). You can definitely get hooked and feel like you're learning something at the same time. Her website for anyone interested is http://http://www.sharonkaypenman.com/penman_books.asp
It's just grass and water till it hits the ground.