I had a Kolsch that didn't drop krausen after 3 weeks. I've heard that cold crashing it will help it to clear and drop, but I didn't try it. I just racked underneath the foam into secondary, since my 5 gallon carboy fits in the fridge for cold conditioning time.
Primary #1: Umlaut my Kölsch VI #2: Sunrise Wit
Secondary #1: Empty #2: Black Currant Wine #3: Empty
Bottles: Spruced Winter Warmer, Big 50 Barleywine, Framboise Lambic, Russian Imperial Stout, Barolo Wine, Berry Rhubarb Wine
On Deck: Dusseldorf Alt III, BGSA