Timing Belt on 2007 Infiniti M35

I am going to buy the above car. When does the timing belt have to be changed, the car has 28,000 miles on it.

Asked by for the 2007 Infiniti M35
The 3.5L V6 engine on this car is driven by a Timing Chain, there is not scheduled replacement for Timing Chains unless they are too noisy or something else is wrong. Follow all the maintenance recommendations.
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