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I believe the manual says 1200 miles. My dealer told me 700 miles...
I just made sure to accelerate each gear through up to power band at a steady, medium rate. I was careful never to punch or drop the accelerator during the break-in period. Although as a DD it took less than 3 weeks to break it in. Seeing as it's my wife's DD, she wasn't too happy about me getting to drive it exclusively for those first three weeks. I promised her I wasn't having any driving fun. It was actually quite stressful in traffic sometimes - the synchro rev match came in handy and helped in getting to know the clutch.