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.
For what it's worth, on the can of Trader Joe's coconut cream, it says to refrigerate after opening and use within 7-10 days of opening. Maybe use that info as a guide? When I open a can of coconut milk, I pour whatever I don't use into a creamer, cover with plastic wrap, and put in the fridge.