As a general rule, the expiry date is that of the oil the compound is suspended in. However, ba is added which has preservation properties. Thus, its likely good for longer than the actial expiry date of the oil used.
Just keep those vials in a dark area that is at room temp in your residence. I just got off a cycle of prop that was 2 years old. It was excellent. I see oils with exp. dates here and there. Most say 3 years from brew date...
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All good info!! I've had to blow dust off some bottles before....... lol!!