It does depend....
They last less time in cold vs. warm weather.
They last less time the more miles you ride.
It's not a time factor it's a use factor.
Had a fishing buddy of mine that would brag how a certain brand of wading boots would last 5-8 years for him. Mine would last about a 2 years. The difference...He fished once or twice a month. I fish 3-4 days a week.
The mailman's brake pads won't last as long as mine either....