As I mentioned in the loose handle thread, SIKAFLEX and 3M 5200 are both moisture-cured polyurethane adhesive. Sealing after opening will save the bulk of the adhesive, but a plug of cured adhesive always develops at the opening (even overnight in humid marine conditions). The cured plug can be pulled out and discarded, while the rest of the tube remains very usable. I would believe your 6-8 months window might be about right.
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