The shelf life of an unused bar of cold process soap from CH Studio is about 1-2 years but we recommend using it within 6 months of purchase as the oils will lose its scent over time. It may last longer if it's stored in a dry place. One way to know for sure if your bar of soap is still good is whether or not you notice any signs of rancidity which is an indication that the oils have gone past their shelf life. Once a bar of soap has been used, the lifespan is all dependent on how you use it and how you're allowing the wet bar to dry. We recommend using a well-draining soap dish to help extend the life of your bar.