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I believe CBS is more than mileage and time and may include things like driving style, RPM, etc. I have had mine go off sooner than 10K and to that point BMW will also change the oil more often if the CBS tells them.
There is also a window, which I believe is ~1,500 miles or so, meaning you can schedule the oil change sooner if the car is within that window.
One last item, CBS items are allowed to be bundled together. Recently (April), I was in for a CBS oil change and the CBS showed my brake flush due in August. The Service Advisor asked if I wanted that done too. I ask, if that was allowed--meaning would I have to pay for it--since it was way out of the window mentioned above. They said that they are allowed to bundle items that are close together. Guess, it helps keep costs down like repeat visits, loaners, etc.
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