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select avg(t2.avg_f) from ( select t1.film_id, t1.store_id, avg(t1.diff) as avg_f from ( select i.film_id, i.store_id, datediff(r.return_date, lead(r.rental_date) over(partition by i.film_id, i.store_id order by r.rental_date asc)) as diff from rental r left join inventory i on r.inventory_id = i.inventory_id order by i.film_id asc ) as t1 group by t1.film_id, t1.store_id ) as t2

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