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Probably forever if the automobile does not over- heat or run out of gas.
I have heard of stories about cars idling all night in a parking lot for whatever reason and
no harm. Maybe autos from the early days might not like it but today... cars can sit for hours
and run at idle with not problems. Give it a shot. leave your garage door open, set your
security cameras and fire up the car and make sure it has plenty of gas. Get up in the morning and check the water temp. You should be good. Let us know. Thanks.
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