About 2 days. I have a pork tenderloin, a bag of shrimp, and a bag of mixed vegetables in the freezer. The pantry is fairly well stocked with various types of rice, dried pasta, canned tomatoes, beans, tuna, olives, salad dressings, etc.
I'm fortunate that within a 3 mile radius there are 4 supermarkets and 2 fish markets. If I increase it to 5 miles I can add a couple more supermarkets, 2 meat stores, a produce market, BJ's warehouse club, Trader Joes, a few bakeries and specialty markets (Asian, Italian, etc.). If I go anywhere in a car I pass by a supermarket. Most of these can be easily and safely reached by bicycle if I don't drive anywhere for a day or two (and it's over 40 F and dry).