This is a question that simply cannot be answered.
There are so many variables. Even things like cooling down correctly after hard driving can have effects, servicing, driving style. Also the tune (heat) can affect things.
IMO expecting stock GTR turbos to last 100k kms in a modified state is begging for trouble and failure, which can take the motor with it.
in a factory state, 200k kms+ can be expected. AND by that I mean 100% factory not even an exhaust