As Mr Rice was saying the rear pads wear quicker due to active trace control, typically about 30-50% sooner than the front pads how long you get out of a set depends on a lot of variables such
as driving habit but typically you can get 40K miles before needed to replace either front or back.
I personally change both fronts and back at the same time to keep same type of pad consistent.
2009 G37 X - Blue Slate - Michelin X-Ice 3/ Michelin AS/3+ Location: The Great White North
Planned Mods: Takeda Stage II Intakes, Borla Catback Exhaust,
G-Stop SS brake lines, Megan Racing Upper Strut-Tower.
“Passion rules reason, for better or for worse.” - Terry Goodkind