How long do you all store your frozen feeders?

[EL Ziggy]

I want to get a general consensus for how long most of you store your frozen feeders. I'm especially curious to hear from those of you who buy online because of the substantial shipping costs. If you can save the shipping costs from buying at an expo or a trusted supplier that's nearby I can definitely see the advantages, unfortunately I don't have that option. Nevertheless, how long do you keep them in the freezer? It seems like (6) months is about the average from what I've heard so far but have any of you kept your feeders frozen for longer periods of time? For example buying a years worth of feeders online could cost me $120-$130 and a (6) month supply could cost me $100-$120 as the price of the food items is lower when you buy in larger quantities (i.e. (25) mice for $16.25 vs. $20 for (50) mice). Any thoughts? I have (2) kingsnakes btw.