Laguna is MURDER on brakes. I burned through an entire set of stock pads on my WRX in 2x 20 minute sessions. By the time I pulled them off back in the office, there's but maybe 1.5mm left in pad material.
My buddy who was riding with me at the time, was wondering what the hell I was doing pitching the car sideways through the Andretti hairpin. I told him my brakes were shot and the only way we'd make the hairpin is if I use the tires to scrub off speed.
Don't try that at home, kids.