Depends on if you put it in the freezer or wait for cold weather. I calculate about 3.5 months here, outside.
On the other hand, I filled 6 gallon-ziplocks about half full with water and put them in late evening, laid flat, in the mostly empty stand-up freezer before going gill-netting last weekend for freezer salmon. Hard as a rock in the morning. (caught one salmon - already et - the ice is back in freezer waiting for some real action)
