How long should rotors last?

[Richard Hoffman]

Well, the title explains it all!  The reason I ask: my parents 97 A6 Avant
Quattro has 90k miles and is in need of its second set of rotors - they are
all just under the minimum thickness.  The first brake job was done under
warranty at 45k miles, so I am seeing a 45k mile interval here.
For the record, the kind of driving they do is pretty typical average
American commuter driving...some stop-and-go, some city, some highway.
Pretty well rounded, non-agressive driving. All brake hardware is 100% OEM,
dealer sourced and installed.
It just seems to me that the rotors should at least last as long as a set of
pads...the pads still have about 5mm of material on them!
Thanks fellow Audi-nauts!
Richard
1990 Coupe Q 215k
1970 100LS 2-dr 46k

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