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How long do I keep...

I have a couple things floating around, and I didn't see anything on the website mentioning use-by dates... unless I missed it, which is quite possible. So first of all, frozen mochi. I bought it for Tanabata (July 7) and used it up one by one, so the leftovers have never been thawed. How long does it last? It's unflavored. Used for moffles, which are amazing.
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