Given that the vast majority of renters will be incoming air passengers it will inevitably be very quiet for pick ups in the early part of the day simply because of the limited number of arrivals especially from international flights. While the garage will be very busy for returns, in my experience the collection desks will be almost deserted.
The major drawback of weekday morning collection is the rush hour traffic around Miami airport which is dreadful and best avoided so I'd recommend a very early pick up or leaving it until after 10 am which of course to some extent negates the benefit.
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