Bluebulb Projects' The Measure of Things presents:
250 is about one-and-two-fifths times the number of John Wayne films.
In other words, the count of John Wayne films is 0.7140 times that amount.
(a.k.a. "Duke", a.k.a. JW, a.k.a. Marion Mitchell Morrison, a.k.a. Marion Robert Morrison, a.k.a. Duke Morrison) (films starring the actor in any size role)