The following are some guidelines for freshly expressed breast milk storage from the FDA and the CDC:• At room temperature (66–72°F) for up to 10 hours• At 72–79°F for four to six hours• At 86–100°F for up to four hours• In a refrigerator (32–39°F) for up to eight days• In a freezer contained within a refrigerator for up to two weeks• In a self-contained freezer unit for three to four months• In a deep-freezer (0°F) for six to 12 months