I used M205 on mine and my paint was in fairly good condition starting out. I did have some fine scratches in a few place and due to my newbness I didn't use enough pressure when doing the hood and later with very high powered lighting I could see a few scratches I didn't get out.
Overall though I got extremely good results with M205 and there's no way I burned the clear coat using it.
Not using any pressure is almost as big of a problem as using too much pressure. A lot of videos imply you should only be using the weight of the polisher but that's really not going to cut it. You need to put about 5-10lbs of force on the head to cut into those swirls unless you're using a more aggressive cutting compound which I definitely would not recommend if it's your first time.
I had a pretty good scratch going across a fender and a door that showed up pretty stark when I put a light on it. It kind of looked like someone with a bag or purse just dragged it along the side of the car.
. At first I could not get it out. I used just a little more polish compound than I thought I needed and a little more pressure and they came out completely.
30 minutes a panel sounds about right to me. It takes time if you want good results.
Overall it's not a hard job, it's just a very time consuming job if you want to do it right. I spent 10 hours on mine and had to throw the towel in after only doing 1 coat of Kamikaze on my entire car and 2 coats on a few key areas like hood and fenders. Temps were plummeting below the recommended application level and I didn't want to turn my 10+ hour day into a further marathon.
I learned a lot doing it, I think next go around I will be able to spend a bit more time and do an even better job. I would also entertain the idea of paying a mobile detailer to polish off whatever remains of the old ceramic and then all I would have to focus on was minimal prep and ceramic application which is a much lower stress job than paint correction.
The only other advice I can give is you want to do this as soon after taking delivery of your car as possible. At delivery go over the car with a fairly bright light and if it's already really beat up see if you can get Tesla to pay for paint correction... It will be a hell of a lot easier to do the polishing and ceramic coating if the car starts out in fairly good shape than if you drive it for six months, let it get beat up and THEN decide it's time to ceramic coat it. In such cases you would spend at least 2X as much time on the paint correction as I did.