The number of miles is random, but you would think failure of any part would, most likely, be at the early stage. My car was delivered with around 50 miles on it and I have put 53 additional on it since delivery. My "failure" came at around 100 miles. It also looks like I do not have a drive unit failure, but rather a failure at some point in the cooling system from talking to one of the mobile techs out of Atlanta. Still not good and you really do not want to drive around with the batteries having a much higher likelihood of going up in flames.
As for the rental car situation, I think that might depend on where the car is being serviced. My car is going to a collision center in Atlanta that Lucid has a relationship with and where the two mobile techs are based out of. One of those techs was asking me for my DL this morning in order to contact Hertz. So, if your service is being performed at a Lucid Service Center, you might get a more complete experience than if they are using a contracted location where the resources are not as great. Makes sense, but it also makes the experience a much more inferior product when compared to more established manufacturers. I am not saying that is good or bad, just something to really take into consideration that might not be communicated by sales in the most realistic of lights. I was always told by my DA that "we have mobile service vans that can take care of most issues and we will get you a rental/loaner for times when your car must go to an actual Service Center". Well, yes they will, sort of.