....is about 9 months, or 1200 miles.
I started having serious chain issues in January when, after just buying a new derailler and chain, I broke my derailler on the APC AES event. I end up breaking the chain in a few places to get it to the right length to make it a 32x16 SS I could somewhat ride out.
I fix the derailler at home and proceed to put together my chain, initially without powerlinks. I refused to buy another chain when the one I had wasn't even two weeks old. I had three breaks I had to fix in the chain if I remember. All of them broke on me pretty quickly, one at the Torts AES event and one or two at the 24 HTOP. These were fixed in January/February of this year with powerlinks. I haven't had much trouble since. That makes it at least nine months before one of them gave out. And yes, I fixed it with another powerlink.
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Thread: The Life Span of a Powerlink