it depends on what kind of freezer and what the constant temperature is.
What I was told was, if you have a deep freezer, you can store it 6-12 months. you can store up 6 months in a normal freezer, but milk should be far back in freezer as possible and definitely not stored it the door.
In the fridge for 1 week!
A normal freezer for up to 6 months
deep freeze freezer for 1 year +
i'm in england, but last i was told was not to freeze it and to store in the fridge for no more than 24 hours. you could probably get an answer from ask . com(ignore the spaces)
Freezing does take away some of the nutrient value in breast milk, but that doesn't mean that you have to avoid it altogether. I use ice cube trays to freeze milk into 1 ounce cubes. Then when the tray is full (14 cubes in the trays I use), I put the cubes in a vacuum sealed bag. I am currently using the ziploc vacuum seal bags, they work great. My little one is 7 weeks old and usually goes through about 10 ounces of milk at day care a day (he is there from 7am - 5pm). The day care returns my bags when they are empty so I can wash and reuse them. Ashiepooh got the times right though is is up to a week in the fridge, up to 6 months in normal freezer, and a year or longer in deep freezer. When milk is thawed if it has a sour smell, throw it out and grab a new bag.
Oh, the reason I went into detail about storage is because your storage method makes a big difference in loss of nutrients and how long you can store it for.