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The short answer is a DA chain is not likely to last much longer than an Ultegra, but Shimano chains in general elongate quickly due to wear on the pins and the bushings formed into the inner sideplates.

A KMC chain will last longer and Campy 10 chains will last longer still.

9 speed chain should not last twice as long as 10 speed. Most people use the common Park chain checker which does not measure the wear properly and the result is chains tossed when they are not worn.

Do a search on chain life and you should get some of the many threads on this subject.
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