Infused vinegar can last for up to 6 months in the fridge. If you'd like to extend its shelf life even further, you can freeze it. Just pour the contents of the jar into ice cube trays and pop out the cubes. Once frozen, transfer the cubes to resealable freezer bags. They'll last almost indefinitely in the freezer. If you leave it the vinegar out at room temperature, in a sealed glass jar, it should last up to 3 months.