How long do frozen feeders last?

My bp gets fed every Sunday, but my indo. legless eats on Friday. I normally go to the pet shop to stock up on anoles for my legless so I don't have to go back for a month. How long do frozen mice last in the freezer? How can you tell when they go bad?

With out hair (i.e pinkies) I think the WWW.rodentpro.com site said 1 - 3 months and with hair 3 - 6 if they have never been unthawed. On the how to tell when they got bad don't really know some one that feeds a lot of snakes FT might be better to answer that.