25 to 50K depending on YOUR driving style and conditions. I have seen OE pads last 15K and some last 45K+
Heavy braking in stop and go traffic wears more pads than the difference in between better quality pads. The cheapo ones can last longer as they have no bite what so ever or can burn away in one afternoon of mountain charges.
Your life and family are worth a LOT, DON'T skimp on brake parts.

Check the pads at every oil or tire check as it only takes a few mins with a flashlight.
__________________

2005 X5 4.8IS
The
Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green