As terrible and frustrating as the process was just to try and GET an appointment; kudos to the rural county health department I used for perfecting a mass drive-through vaccination clinic. It was a well-oiled machine. I was back home in an hour, and the trip itself was 20 minutes (one way).
Not a huge clinic by any means, but 300 or so people scheduled with arrival times spread out between 10am and 1pm.