To preserve truffles for a longer period of time, you can store them in the fridge. When stored in the fridge, truffles can last up to two weeks. However, it's best to consume them as soon as possible for the best flavor and aroma. When storing truffles in the fridge, it is important to wrap them tightly in order to prevent them from drying out. You can wrap them in a paper towel or a cheesecloth and then place them in a container or bag. Just make sure that the container or bag is airtight so that no moisture can get in.