How Long does the X3 Clutch Last

[Flyer1]

I have ~ 85k miles on my 2004 X3 3.0i. I sometimes, not always, get minor shuddering when starting out - like the clutch might be slipping. I know its subjective to type of driving, but how many miles should you get out of a BMW clutch in the X3?

Searching the X3 formus, another explanation could be the clutch delay valve (CDV) and my shifting technique don't get along. I'm going to replace it with one modified by Zeckhausen racing based on a couple posts I read here. Hopefully its the CDV and not the $$$ clutch.