This depends upon how it is being stored after it has been opened. If the cork or something similar has not been placed to keep it fresh, probably 2-3 days at most. If you do have something to keep it fresh you are probably good for a couple of weeks or so. You can buy champagne keepers at a place like Bed Bath and Beyond or other places of this kind.
Champagne should be chilled in the fridge for at least 2-3 hours before serving to reach the optimal temperature of around 45-48F.
Pork is good in the fridge for 3-5 days after thawing.
Thawed breast milk is good in the fridge for up to 24 hours.
Brisket is good in the fridge for 3-4 days before it spoils.
Potato salad is typically good for about 3-5 days when stored in the fridge.
Salsa is typically good for about 7-10 days after opening if stored in the fridge.
Scallops are good for about 2-3 days in the fridge before they spoil.
as long as your willing to eat it.
Don't leave it more than 3 days in the fridge.
Cooked eggs can be stored in the fridge for up to 7 days.
A latte is typically good in the fridge for about 2-3 days before it goes bad.
Turkey typically stays good in the fridge for 3-4 days before it spoils.