I don't know for a fact how long it is, but I believe the manga is still way ahead (another member said this not so long ago), and I'm not sure just how much crap they will be able to produce.

Naruto is on a ship with only a handful of ninjas, sailing for an island that should be weeks, not months, away. Unless the anime is willing to make episodes with little or no Naruto in them they are going to have to drop the fillers soon enough. I figure we have about 2-3 more episodes of filler left. That or a few episodes on the other teams.