15-20 minutes for the battery, 45 to heat up and run all the various fluids throughout the car is what I was always taught.

45 minutes

I don’t know about how often, but when I lived where I worked and was only driving a mile a day, I was advised to occasionally take drives of at least 15 minutes.

I don’t need to drive more than a mile once a week now. How long should I drive my car or idle it to keep the battery from dying?

Thanks!