It takes me 10 years to wear out rims on a full-size bike ridden daily. I would need to ride around the clock with little sleep to wear them out in 9 months. I recall, though, that I needed to change pads twice a year when riding a bike with cheap components and being unable to differentiate between low and good-quality components. I vividly remember my anxiety after changing to better-quality brakes and finding out that the pads were still good after 2 years of riding.
9 months, 5500 miles , fairly hilly and quite a bit of grit on the roads. I was 20 pounds lighter then , could be worse now ?