(Aside: Most wiper blades only work well for ~6 months and then they start to really suck at wiping. I'm hoping the Latitudes on the front will last ~12 before getting to that point [see next Aside below]. Consumer Reports says they should [wipe as well after 6 months as they did when they were new], but whether they will or not is another matter.)
(Another aside: "Rain-X'ing" your windshield reduces the need to use the wipers in the first place, which increases their useful life span by reducing actual wear. They'll still need replacing due to age, but that would theoretically be longer than if they wore out from use.)