Refrigerated, it will last a long time, months to even a year or more. Even stored at room temperature, I've had kegs that were good a year later. The hop flavor in IPA's will tend to fade over time but otherwise you should be good.
Draft 1: Lightly smoked Weizen
Draft 2: Belgian Wit
Draft 3: Rauchbier
Primary 1: German Scwarzbier
On Deck: Belgian Brown Ale, Pale Ale, Stout