I have a small store bought jar of pesto in my fridge, and wondered how long it will keep? Since I only use a bit at a time, this jar will last me forever. Just didn't know the fridge life of it. I'd freeze it, but since I only need a tablespoon at a time, I'd hate to go through the process of trying to get a bit at a time to use. Plus it's been in there for about 3 weeks now.