I remember reading in some audio/hi-fi forums that 5-10 hrs is enough. Irony is i did not even do the run in thing for my x10s as i only read about this practice recently but from the first use they impressed me. Well no harm plugging them in for another 10h or so then testing again. I doubt the cable issue has anything to with being a bad pair. It's the overall thickness of the rubber housing and joints at the buds/3.5 connector. Doing a quick search on apple.ca there seem to be others who are experiencing cable failure too due to poor quality.
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