you can kill a clutch in an afternoon if you want....
the simple answer is that the clutch willl fail from HEAT and not from the power.
heat come from slipping.. if you tell the engine to deliver power, and dont transfer that power to the wheels then you will burn the clutch..

SO, if you engage the clutch with the engine at idle . before you floor it.. and also change gears without slipping the clutch will last indefinetly.

I admit the X-type is hard to do that because the pedals feel numb.. but slip = wear...

dont kid yourself on habbits etc.............. fast driving and agressive driving can co-incide with long clutch life if you dont slip it...



now for the more mainstream answer... dealer techs tell me they have never changed a clutch because of normal wear.. they are well designed and last well with normal driving. There may even be some design level stuff where a decent clutch was used. because the 4wd makes it hard to replace.
I feel that my clutch is a bit slow to engage. if i dump it.... I wonder if there is a delay valve in the hydraulics a la BMW>..??

B

 

slip is one thing.. of couse there are different speeds of the flywheel and clutch disk and to engage the clutch, something has to change speed for them to engage. What you need to do to minimise wear from slipping is not try to apply power until the clutch is fully engaged.. either when starting from a standstill or during a shift.