Breast Milk stored in a Refrigerator (less than 39 degrees F) can last 3-8 days.
Breast milk store in a standard freezer (0-4 degrees F) will last 3-6 months (like a top-bottom or side by side fridge & freezer).
Breast milk stored in a deep freezer (less than 0 degrees F) will last up to 12 months.
Remember to rotate your stock and always check your breast milk before giving it to your baby - if it smells or tastes funny then its likely gone bad.