i hope that it is between 2 and a half hours or 3 hours cos then it would last longer and they would beable to fit alot more in (and i think alot of people wouldn't mind sitting in a cinema for 3 hours :L)
they might even split it up into two movies like Harry Potter (i think there are 7 books but 8 movies) but i doubt it because people might not like it how the movie ends just before or after bella becomes a vampire. or it might cost to much money
but no one can be sure until its an actual done deal...i doubt the producers for twilight and new moon even know.

I think they should make the book into movie of two parts :).