I'm not sure what my favorite is, but probably a week unless it was served a different way each time. I guess it really depends if we're talking meal vs just food, since I'd likely be more than okay with having various beef products for lunch and dinner. That might take me months to get tired of it, as opposed to just weeks for something more specific like variations on a burger.
But, if we're talking a specific product and not having it all the fucking time, probably astronaut ice cream.
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There are precious few at ease / With moral ambiguities / So we act as though they don't exist.