Like I said, maybe 1-3 drops per hour. I put an old skateboard under it and in a week the whole thing is wet. And I can't see it leaking from being over-filled if the car hasn't moved.
1998 BMW 328is - summer
1994 BMW 325i - daily
1992 BMW 325i - totaled
1988 Mercedes Benz 190E 2.3-8V - sold