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Homemade jams can last for years if properly prepared, but factors like sugar content and storage conditions are crucial. High sugar concentration inhibits microbial growth, while acidity from fruits also plays a role in preservation. Jams with reduced sugar may spoil faster and require refrigeration. Once opened, jams should be stored in the fridge, and any signs of mold or spoilage mean the entire jar should be discarded. Proper storage conditions are essential to maintain quality, and if there are any signs of fermentation or contamination, it's safer to throw the jam away.