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SELECT c.customer_id, c.first_name, c.last_name, CEIL(AVG(TIMESTAMPDIFF(HOUR, r.rental_date, r.return_date))) AS average_rental_time FROM customer c JOIN rental r ON c.customer_id = r.customer_id WHERE r.return_date IS NOT NULL GROUP BY c.customer_id, c.first_name, c.last_name ORDER BY c.customer_id;

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