My personal experience so far with Tesla specifically - and this is not to say they are doing the right thing in regards to parts or anything - was when my wife hit a deer and a bunch of the driver's front side of the car had to be replaced was that it took six days. Of course the bill insurance covered was around $12K which is just insane (headlight, hood, fender, panel, side mirror, camera). The timeline to repair was probably because the Tesla density for my area (around Richmond, VA) is not high like it is in places such as California.

Other than that, which was $0 out of pocket, I've had my Model 3 for six years in July and almost $0 in parts or service. I replaced the 12v battery which I had to buy for $75 and tires twice. This way more cost effective than my Lexus (around $4,000 in repair service over 5 years, not counting tires) and Mercedes (around $3,000 in repair service over 2 years, which - not counting tires and I had these AMG rims that were wider on the rear tires so tire replacement had to happen early). So its hard for me to complain about Tesla, but I can see where for other people who have had issues where there are a lot of Teslas on the road could be an issue.