They last anywhere from 9k miles to 30k miles, based on how you drive. NJKSC27 gave a great guess.
They only have a 140 wear rating, and are pretty sticky, even though they are runflats. The stiffer sidewalls make the tires wear a bit faster than a more pliable non-runflat.
BMW is historically aggressive on rear negative camber too, so expect the insides of those tires to wear out sooner than the outsides. I've heard of people swapping the runflat tires on the wheels, but the tires are clearly marked "outside".
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