I'm not sure there is a maximum time. I have had batches that sat for more than 6 months before I finished pulling from it and I still did a couple pulls.
I imagine it could be a very long time before it went bad.
I think the important thing is that it is stored in an air tight container so that you dont loes any water through evaporation. I would also keep it dark and cool if I were going to store it for any period of time.
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