A long 3 years
People use to complain that dragon ball z fights lasted too long. This is true. especially in the anime.
But in naruto, when people say that the last arc dragged, it REALLY REALLY DID. This war started (and by started, i mean the point where the troops were officially deploid) in march of 2011. thats almost 3 years ago. Thats ridiculous. That means that the past 3 days in naruto (i think we've only seen nightfall 1 or 2 times) has lasted 3 years.
If we just look at the current fight (SPOILERS)
We've been fighting obito and then madara on the same battlefield for a little over 2 years. This is ridiculous. I can't believe that a single fight has gone on for SO LONG.
when people say that the series should have ended with pain, i agree. If you take away all the loose ends that needed tied up, it would have been a better place to end.