I cant answer your question conclusively but I can say that fingerhash (or whatever you may call hash that is made from hand rubbings) does not last nearly as long as you want it to. The oils from the makers hands will invite molds, bacteria etc to form after a few months. Seived or pressed hashes are better products for long term storage but I couldnt tell you from experience what the best method is. I would assume that the freezing would rupture the glands causing accelerated oxidation and loss of potency over time. Ive always wrapped it tight and kept it in a cool dark place. But ive also never kept it more than a couple months.