These will last for 1-2 years. That is the beauty of canning! Being able to preserve food for an extended amount of time! If for some reason the seal is broken or compromised at any time during the canning process or after, discard it immediately. You do not want to risk getting sick from the bacteria that can grow if the seal is broken and contaminated. Use in any recipe that calls for canned tomatoes such as chili, tacos, marinara, pasta, etc.