Since opening the new immigrations area down the stairs near gate 6 in early May, times to clear have improved quite a bit. 30 minutes as stated above is a good benchmark, and I think will leave you with some time to shop the duty free at the baggage claim area.
Chances are that it will be raining in the afternoon this time of year, so it is great that you are leaving the driving to someone else. It can be a very trying adventure in the rain.