pploo,

the main concern you have with burning the clutch plate materials is when you letting the clutch out and the plates are coming together. If you are hard on the gas at this time, the plates will have increased friction (as the clutch is not fully released and the plates are not tight against each other and will be slipping).

In racing with hard starts is when you tend to burn the clutch plates out quicker then just holding the clutch in at a dead stop.

You do want to make sure that your clutch it adjusted so then when you have the clutch lever in, the plates are loose enough that they are not "grabbing" causing un-needed wear. Of course you also want to make sure that when the clutch lever is releases, the clutch plates are tight against each other so you don't have any slip on power which will also burn the clutch plates out.

A properly adjusted dry clutch in normal street riding conditions will last just as long as a wet clutch. Riding in stop and go traffic when heavy take offs will of course add additional wear to any clutch.
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Charles Gallant