Am considering renting from Budget or Hertz in Athens International Airport (both on-site) and returning the car at 0700 at the airport in order to catch flight to Heathrow at 0910. How long does it take to return a car to either of these two car rental companies? Is it as efficient as say, returning at DFW, or is it much more involved with long lines etc.? Should I return the car the night before and then get a hotel with a shuttle?
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