I have been wondering the same myself as I have a Peugeot 406 at 210k and a C5 at 188k both with the clutch pedal at the top of its travel, both Hdi. I can't really give you an answer the only thing I can say is that driven gently they can last a long time, the 406 was like it when I bought it and doesn't appear to have got any worse in the last 25k, I haven't done a lot of miles in the C5 yet but there is no sign of DMF failure or clutch slip.
You will probably get more infromation from a Vauxhall specific forum.
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