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The OP might not be super familiar with this specific M3 and its dynamics, but might be a very good driver. He is asking a valid and important question. Useless comments challenging the information clearly stated are just counter productive.
Like others mentioned, some more track oriented cars can run with 30% pad life. E9x's are so damn heavy which really effects its brake performance, especially as the pads wear. A GT3 RS is obviously much lighter and has better brakes so it can handle less brake pad life much more. I would definitely not go out for a hard day with the current brake life with an E9x. Get new pads and some good brake fluid something like RBF-600 before running it hard.
I still remember when I was running my stock E92 pretty hard a couple years ago. I could feel the fade quickly, but I kept driving. I was coming down the back straight at Mid-Ohio at about 145MPH and needed to brake to about 60 to make the sharp right hander. I pushed hard with very little response. Somehow I was able to slow down just enough to stay on track and not into the gravel. Scary couple seconds for me! They fade really fast with hard driving and on tracks with big brake zones. I really would get some RBF-600 brake fluid or something similar and get new pads before going out for a hard day. OEM brakes simply can't stop these heavy beasts!
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