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Well. I wish i could remember for sure. But i think it was either
a) uncapped for a week + 2 days or
b) capped w/ a leak for a week + uncapped for 2 days.
Well, making a new co2 solution is pretty easy and cheap, so it'd take 5 minutes to start a new one. Try shaking it, and you should hear some bubbles if its still working.