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: Empty #2: Empty
Secondary #1: Blackberry Rhubarb wine #2: 2 Hearted IPA #3: Cab MerMarqeNac Wine
Kegged: Border Crossing Vienna II
Bottles: Big 50 Barleywine, Framboise Lambic, Russian Imperial Stout, Barolo Wine, Berry Rhubarb Wine, Black Currant wine
On Deck: BGSA, Pumpkin Ale, RIS, Pre-Prohibition Lager