Is timing belt replacement considered scheduled maintenance on a 2000 Mitsubishi Montero?

The 2000 Mitsubishi Montero 3.5L is listed as an "Interference Engine" under timing belts in the www.RockAuto.com auto parts catalog. This means the valves or other major engine parts will be damaged if the timing belt breaks while the engine is running. So replace it as part of scheduled maintenance. Many manufacturers recommend changing the timing belt every 60K miles. I do not know if Mitsubishi recommends different mileage intervals.