How long the clam juice remains tasty in the freezer will be variable and dependent upon how you package it and the type of freezer you use. Little juice cubes in zipper bags will pick up freezer flavors more quickly than juice stored a rigid, well-sealed freezer container. Frozen food also picks up off-flavors faster in a freezer that has defrost cycles. You may have to try to different storage styles to see what works best for you. A solid juice block in a rigid container should keep for up to a year. The juice cubes in zipper should likely be used in a few months, but could be more convenient.
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3 days.
Indefinately often
7 years
It depends on the ambient temperature.
Blackberries (the fruit) will last about three months.
I don't know, but it'll last for a long time in the freezer.
Butter can last up to 12 months in the freezer. See Related Links.
Lemon juice will take a couple of hours to freeze in a traditional freezer. The exact length of time with depend on the temperature of the freezer.
3 months
about 2 days
uncooked can lost for one week to ten days in deep freezer