You should try to use it immediately, but it will stay fresh in the fridge for up 2-3 days in an airtight container. However, be aware that fresh avocado starts to turn brown the longer it's exposed to air. To maximize the shelf life of avocado spread, it's best to store it in an airtight container and make sure it's completely covered to prevent air from getting in. It's also important to store it at the proper temperature, which is below 40°F (4°C) to inhibit bacterial growth.