All RPMs cause 'damage' to the clutch - the clutch is a friction disk that wears every time you use it, just like your brake pads do. Don't be terribly afraid of the wear - it is designed to function that way. If you're excessively slipping the clutch at high RPMs, you're causing more wear. For example, you can cause the same amount of wear to the clutch by slipping it for 2 seconds at 5K RPM - as you would by slipping it for 6 seconds at a more generous 1800-2000RPM.
I sometimes double-blip the throttle when I take off. One blip to about 2K as I let off the clutch and feel the engagement, and immediately the second blip is to catch and hold the RPM around the 1500RPM mark as I accelerate and slip for about 2 seconds or so. I don't find myself doing this on other MT cars - cars like BMWs and Audis have much more linear throttle response. Where as the throttle on our cars is a little crazy and inconsistent and can feel different every 20 minutes.
There is nothing wrong with slipping the clutch. 2 seconds on a flat road at lower revs, and about 3 seconds on a hill with moderate revs is okay. You'll know if you're cooking the clutch...burned clutch smells like tire smoke + garbage. But again, it takes quite a bit of stupidity to cook a clutch during normal driving.
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