With most joints I would say that if it withstands the load through multiple cycles, I am confident it will last indefinitely (disregarding extreme heat/humidity etc.). Listen closely when you restring, particularly when lowering the string tension. If there's any cracking, it's a sign that the joint is being fatigued each time it's cycled, and eventually will wear out.
That being said, if it can withstand string tension, most of this goes by the wayside since that is significantly more load than most joints take.
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