The storage duration of breast milk depends on the storage conditions:
At room temperature (up to 77°F or 25°C): Up to 4 hours In a refrigerator (at 40°F or 4°C): Up to 4 days In a freezer (at 0°F or -18°C): Up to 6 months, although 12 months is acceptable
Always follow the guidelines provided by health authorities and consult with a healthcare provider if unsure.