You can keep uncooked boba pearls in an airtight container. Place the container in a cool, dry place, and the pearls will stay good for up to 6 months. Cooked pearls, on the other hand, do not have a long shelf life. Completely submerged in sugar syrup and refrigerated, they’ll stay good for 72 hours. Keep in mind, though, that the longer you keep them, the more their texture deteriorates.