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i would imagine typically a few years, but as long as you shake it up and keep it away from extreme (hot/cold) temps then you should be okay to use it for a while. I have some ceriglass that's over a few years old and it still performs as long as I give it a good shake because of it's watery consistency...
That is what I was thinking as my bottle still looks like when I bough after shaking it. weird thing was seeing a date on the bottle, why do that if it did not matter ?
they probably put the date on their so they know the production run...