How long to pick up rental car at CCC?

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How long should we allow (round trip) to pick up a rental car at the CCC? We are trying to decide whether we should pick up the car at MCO when we arrive, or wait until we actually need the car and pick it up at the CCC. We like the idea of taking ME from the airport, and could save a bit of money renting from the CCC, but we're not sure if it's worth the time out of our vacation.