Best Answer: At room temperature for up to 8 -12hrs Fresh breast milk will stay good: * At room temperature for up to 8 -12hrs * In the fridge for up to 5 days (some books say 8-11 days.) * In the freezer, at the back, for 2-3 months * In a deep freeze 4-6 months *thawed in fridge for upto 24 hours, 1 hour at room temp. have some frozen breast milk that I thawed in the fridge for several hours. Can I take the milk out of the fridge and get it to room temperature so I don't have to wait for it to warm up (basically in the middle of the night).