Over 6 months with my P90D and it has not yet seen a drop a rain. But that is not long compared to some Corvette owners I know which have gone more than a decade without the car ever being out in the rain. To be fair, we treat our Tesla special as a fun around-town car. It's never been on an overnight road trip nor has it ever been on a super charger. It is a spoiled and pampered car but SO much fun to drive. My wife and I are in our early 60's and call the Tesla our "not dead yet" car.