As long as you keep them dry and they don't oxidize, I would say indefinitely. I have a couple pairs of Synergistic Research interconnects that I bough in the early 1990's. They still pretty much look and sound the same as when I bought them. On balanced cables I would be careful not to put that much stress on the XLR fitting. I had a set of ARC cables I had to have re-terminated because the wires came loose. The ARC cables were fairly thick and heavy. I now put little supports under the wire ends of my balanced cables.
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