I just had to have the blower motor replaced in my 2017 Toyota Sienna that has 35,000 miles on the odometer. The bearings developed a terrible screeching noise. On the other hand, the 2011 Sienna my son now owns has 140,000 miles on the odometer and has never had to have a blower motor. He also has the 2006 Chevrolet Uplander I used to own. It has traveled 250,000 miles and has never had to have the blower motor replaced. I had a 1978 Oldsmobile Cutlass Salon that I purchased new. I had the car less than a year and had only driven it 12,000 miles when the blower motor has to be replaced under warranty. That motor got noisy after a couple of years. I bought a replacement at NAPA. That blower motor was under the hood and was easy to replace–just a 15 minute job. The blower motor from NAPA had a lifetime warranty. I think I had two free replacement blower motors in the 33 years I owned that car.
Unfortunately, the blower motor on the Sienna is under the right side of the dashboard. At my age, I didn’t want to do the contortions do get under the dash to replace the motor, even though it didn’t appear to be a real difficult job.
On most modern cars, the blower motor runs most of the time and wears out faster than in the old cars that didn’t have air conditioning.