I have seen them in the upper elevens.
the problem with all the cranks these days is the number of cycles and abuse that they have undergone. If the crank is low mileage, then it should be a lot stronger with regard to future life than one that has 150,000 miles of hard running...
It may be that a standard crank (NA crank) is actually in better condition with regard to metal fatigue that a turbo crank that has been hammered on for years