Depends on the freezer, a lot of stuff lasts an awful lot longer than that, the only thing I find that really does not age well in a freezer is fish or perhaps some pre frozen bought stuff. I know mashed potato lasts very well in my upright freezer but in my Dad's fridge freezer it has a much shorter life span, his freezer is clearly not as good as a stand alone one.
Good packaging is vital too.
Good packaging is vital too.