rough-and-ready Exhibiting vigor and vitality which, though unrefined and perhaps indelicate, is appropriate for dealing with a given situation; crudely efficient; rough in manner, but prompt and effective in action.
1 The exact answer to the question âHow long does an unopened package of sour cream last?â depends to a large extent on storage conditions â to maximize the shelf life of sour cream, keep it refrigerated at all times.  How long does unopened sour cream last after the sell-by date? Sour cream will generally keep for one to two weeks after the sell-by date on the package, assuming it has been continuously refrigerated; be sure that the temperature of your refrigerator remains at or below 40Â° Fahrenheit at all times.
Milk, cream, and yogurt are all stored in the refrigerator without question. Left at room temperature, it doesn't take long before they start to spoil. Butter is, after all, made from cream, so there is logic in thinking that it, like cream, should also be stored in the fridge â but there's a difference. The primary component of butter is fat (at least 80 percent).