I cycle all of my seeds through the freezer to kill bugs. Two days seems to be about right. If I'm feeling really anal about a particular batch of seeds, I'll put them in the freezer for two days, take them out for a week, and put them back in for another two days. I've never had a bug problem in seeds treated that way and stored in glass jars. Bugs can chew into plastic bags and re-infest seeds.
I don't typically cycle dehydrated food through the freezer, but it wouldn't hurt to do so as long as it was in an air-tight container.
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