I brewed a hefe a few weeks ago--my krausen lasted much longer than with any of my other beers. I think the carapils in it (which helps with head retention) is the cause. But I may be completely wrong here.
My Hefe is my favorite for sure. Mine is usually done in 10-14 days however I always let it go for 4 weeks to clear up a bit. Had a couple bottles last night that still had the cloudy look but with very little yeast sediment.
Thanks the others I have brewed the kraussen was gone when I checked the gravity for bottling so it kinda had me worried. I knew that hefe ferments pretty aggressivly so I had a blow off tube the firts few days.