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Once a hard, dry sausage is opened, it can be stored in the refrigerator for three weeks. Semi-dry sausages like summer sausage can be stored in the refrigerator unopened for three weeks. Once opened, they can be stored in the refrigerator for an additional three weeks. All sausages can be stored in the freezer for up to two months.
The sausage kits that I use say it is safe to store in the fridge for 2 weeks, and up to one year in the freezer. I would say if it is vacuum sealed you would be safe for longer in the freezer, as long as it doesn't get freezer burnt you will be fine. Sooner or later it will start to loose its flavor in there.