Last weekend roundtrip:

At ORD last Friday for an afternoon flight on UA, Parked at car at Thrifty at 4:04pm, got my Boarding pass at 4:17pm (using the self check in inside the terminal) cleared the metal detector at 4:23pm. I would have been less time if not for the lady in front of me with a backpack, carryon bag, a parse and a waist-pack; I couldn't believe they let her pass (carry on limit, not security).

For the flight back from LAX (Sunday morning) getting to the terminal from Parking lot B was the biggest delay factor, once I was at the terminal the whole process (getting boarding pass and clearing security) took less than 15 min.

In both cases I was able to catch an earlier flight (I only had one small carry on bag).

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Sagy