I'm not a huge fan of massive battle scenes. So a 45 minute battle to finish of the Hobbit (which should have only been one film long anyway) seems absolutely mental. Good luck keeping my attention Peter Jackson. I might just watch the whole of Dumbo instead, it will take less time.
A few new details have emerged regarding series curtain-closer The Hobbit: The Battle Of The Five Armies, with EW confirming that the film will conclude with an epic, 45-minute battle sequence. The set-piece will bring the series to a close in spectacular fashion, as Sauron makes a play for Middle-earth by dispatching his forces to launch a concerted assault on our heroes. However, if you are concerned that 45 minutes of sword-swinging might become a bit wearisome, Peter Jackson is quick to reassure that the sequence will be designed to avoid losing the audience… “We have a rule that we’re not allowed to go more than two or three shots of anonymous people fighting without cutting back to our principal characters,” says Jackson. “Otherwise the audience just ends up with battle fatigue.”
http://www.totalfilm.com/news/the-hobbit-will-end-with-45-minute-battle-scene