If they're vacuum sealed, you can keep them for probably a couple years before they get freeezer burned. Loose un-bagged rodents get burned in a few days, rodents packed in ziplocks will start freezer burning in a week or so. But really it's only on the toes and ears and tails. And freezer burn is just dehydration, so when you thaw them, if you use water, it pretty much solvews the problem unless the whole rodent is beef jerky.
I would vacuum seal them in small packs so you can pop out a pack every time you need to feed.
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