Its a bit of a how long is a piece of string type question.
People get hung up far too much on the number of kms a car has done when you really need to know its history. Check to see if it has been serviced frequently etc. Any signs of possible abuse. There are a number of GC8s getting around now with 300k+ on the original motor, and there is also a number of them with less than 100k and they are on their third motor etc.