Not sure if this will help you. When I was in USA, I had a freezer that I bought just to store milk. I stored for 6 months. Most books (in the US) would say 3-6 months depending on the freezer and how low the temp can go. Regardless of what freezer, the milk should be kept deep inside the freezer and don't put them near the freezer door. look for info on temp vs. length of storage.