300000 miles
If you keep up the service like your sopposed to do... Forever.
I have 100k on mine and they are fine.. mostly highway miles.
Most IS 250s, depending on driving, get about 25000-30000 miles on the front brakes and rotors.
The 2009 Lexus IS-350 is 15 ft. 0.1 in. (180.1 in.) long.
The 2014 Lexus IS-350 is 15 ft. 3.7 in. (183.7 in.) long.
The 2012 Lexus IS-250 is 15 ft. 0.3 in. (180.3 in.) long.
The 2013 Lexus IS-F is 15 ft. 3.5 in. (183.5 in.) long.
The 2012 Lexus IS-F is 15 ft. 3.5 in. (183.5 in.) long.
The 2010 Lexus IS-F is 15 ft. 3.5 in. (183.5 in.) long.
The 2009 Lexus IS-F is 15 ft. 3.5 in. (183.5 in.) long.
The 2009 Lexus IS-250 is 15 ft. 0.3 in. (180.3 in.) long.