I agree that 2X a day is excessive watering and poor practice.
Excessive watering promotes shallow roots, which just makes the lawn
need more frequent watering. It also promotes disease and fungus.
As to watering the car 2X a day, I have to disagree with the poster
claiming this is not harmful to the car. Even pure water works it's
ways into nooks and crannies, nicks in the metal, etc., where it can
remain for many hours before it drys out. Over time, this promotes
rust. Just take a piece of steel and leave it out in the rain as
compared to keeping it dry and you will see what happens. Modern cars
have pretty good protection against rust, but it's not perfect and
over time the frequent exposure to water will have an effect.