Timing belt replacement mileage on 2003 Kia Optima

at what mileage should timing belt be replaced and what should be approximate cost (Kansas City area)?

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3 answers
IT IS AT 60,000 MILES PER KIA RECOMENDATION.....
Kia Recommends replacing the belt every 60,000 miles, and the timing belt replacement has been added to the RepairPrice Estimator. Please check here for your estimate: http://repairpal.com/estimator
I believe it's 60,000 miles