At first I thought NYBoy was asking me directly. It's been over two weeks since I've gotten to the grocery store. Milk and bread are gone, but I have powdered milk as a back-up and would make bread today if I don't get to town -- DH is shoveling 4-5 inches of heavy stuff from yesterday, and I heard the plow go by.
I suspect it would be a bit over a month before I lost my ability to be creative and started cooking for content alone. That would give me another month. Power going out and not being able to get to town would probably bring it down to a couple weeks. If needed, I could wrap up the cold foods and drown them in the neighbor's pond for a longer time.
I fear the fins, furs, and feathers will be out of food before I am. I'd have to send DH out hunting.