What I heard in a "news" report back when the jabs were first stating up was that the vials needed to be kept at some ridiculous sub-zero temperature for storage (hence the need for them to contain antifreeze!) and then they're brought up to a refrigerated temperature (or room-temp, I don't exactly remember) on an as-needed basis based on existing appointments so they can then be jabbed into unsuspecting sheeple. If they stay too long at that "jab-ready" temp, they go bad and have to be tossed.

So if that's the case, make all the appointments!