From my experience. A long way, 5k or more maybe but your mileage might vary.
But gee - easy enough to take off a wheel and check how much meat is left on the pad. Be aware there are only 2 sensors one on one of the front wheels and one on one of the rear wheels. Forget which wheels specifically have the sensors so you really need to to check all pad thickness anyway in case there is uneven wear.
Also would add the sensors have been known to activate just by sticks / stones etc flying up and damaging the sensors. And if the rear has been recently replaced then I would suspect a loose connection. Another reason to physically check the pads and the sensors.
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