Ive had none disc carbon wheels that lasted 5 years even with winter so i i think you are setting the bar way to low.
The whole 'measure by time' is a red herring anyway - it's measure by load - kms ridden by your average mamil is a fair proxy I'd say.
@Howard started
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Ive had none disc carbon wheels that lasted 5 years even with winter so i i think you are setting the bar way to low.