A friend of mine had a timing chain on his Intrepid break, causing serious engine damage. That made me search for the recommended replacement time for the XF chains. I could not find it, I found that someone else had looked for it previously also to no avail.
As I presume this car has valves that will hit the piston if the chain breaks and the fact that I expect some of the earlier models have reached the normal mileage that some cars are supposed to have the chains replaced, I would assume that some chains are quite worn. I would hope that these chains are the better quality roller chain and do have a good life expectancy, but when should they be replaced? I hope that these chains can be replaced by the owner without too much trouble, it is an easy job if you have the correct tools and the time.

Edit: When I say replace chain this means sprockets etc as well. There is no point in doing a half a$$ed job.