The company I work for downpacks various silicones and other adhesives into really small syringes for use on the assembly line. They store them in a deep freeze (-40°ish) and put a shelf life of 6 months on each one. That's just protocol though; I'd wager they'd last much longer unless they're frequently reopening and closing them.
Most of these silicones are RTV or room temperature vulcanizing. The freezer definitely slows things down.
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