How Long Does Breast Milk Last ?
As long as possible, expressed breast milk should be used while it is fresh. Nevertheless, at room temperature, expressed milk can be stored for as long as 8 hours without getting spoiled. You can also store the breast milk in a refrigerator in a sterilized plastic container extending it’s life to 3-7 days.
Other people also freeze their breast milk which can be kept for up to 3 months. Hope that helps.