According to the website of World's Largest IMAX Theatre - the IMAX Sydney, the running time of the upcoming war film 'Harry Potter and the Deathly Hallows - Part 2' is 125 minutes (approximate).
But this one is still unofficial since they use the word "approximate". Maybe the 125-minute length is without the end credits. I know I need to choose quality over quantity but as a die hard Harry Potter fan, I want more, I really do not want this series to end.
Here is the link
Photo by Warner Bors. Pictures