Storing mice in freezer and how long do they last?

[Sasha2]

Ive stored up quite a few mice(from tiny pinks to adults), and am still breeding so more to come.Im just curious how long will they last? They're in ziploc bags.
If I were to get one of those vacumn sealers would it help them last longer or would it make that much of a difference?

Should I be dating and cycling them as I put them in the freezer? Im going to be adding another colony of mice in spring, so will have even more mice to freeze.Ive realized Ive just been stuffing them all in without much of a plan so need to get more organized.