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An opened package of ricotta cheese typically remains edible for a similar amount of time as an unopened package in the refrigerator: five to seven days beyond the best before date.. Both opened and unopened packages of ricotta cheese can be stored in the freezer for up to three months.
Report Abuse. A long, long time. Cheddar is a hard cheese, so it will last weeks or months in the fridge. Because it's a hard cheese, any mold that grows is local, and doesn't infect the rest of the block of cheese.Just cut the moldy part off.est Answer: If properly wrapped, a very long time. You gotta remember, cheese is already several weeks to several years old when you buy it. Cheddar is generally six weeks to a few months old (the sharper it is, the older it is).