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A frozen turkey will be good for 3 months, if frozen in water 6 months. After 3 months it will start to dry out unless frozen in water.
Because you aren't going to eat frozen ice. Are you? :)
Dry ice is nothing more than frozen carbon dioxide. The liquid form cannot exist on earth. When dry ice melts it turns to a gas... thus it would probably be impossible for you to keep liquid dry ice in your fridge.
Put it in a freezer or a bucket of dry ice; but the freezer is better.
Frozen carbon dioxide is also known as dry ice. It can be used to keep things (such as perishable foods) cold.
Ice cream is usually kept in a freezer, but if it is to be kept cold when camping, boating, or for a picnic, dry ice is readily available from dealers usually listed in a telephone book or on the internet in most cities and towns. Dry ice is frozen carbon dioxide that sublimates (vaporizes) into carbon dioxide gas very slowly while keeping frozen substances well below the freezing point of water, and it leaves no harmful residue.
Dry Ice is made up of a chemical. When exposed to air it dissipates. The more the air gets to it the faster it disappears. To make you dry ice last longer, just keep your container closed and make sure it is air tight. The Ice Cream Man
As long as inside the container is below 2 degrees you should be good. Id say 3 pounds should be good for about 2 hours.
Use a Styrofoam cooler, place the ice cream in the bottom of it then fill with dry ice. That will keep it frozen solid for many hours. But never touch the dry ice, its so cold it will cause instant frost burns on skin.
It will keep longer. If it's not frozen it will dry out and go stale much quicker.
If you keep it dry and room temerature, decades.
It does not melt into water like regular ice. It sublimates to a gas when it warms up, making it a lot less messy to keep next to your ice cream.