At what mileage should you change timing belt on a 2001 Toyota Sienna?

According to Toyota's recommended maintenance schedule, the timing belt on a 2001 Toyota Sienna should be inspected every 60,000 miles and replaced every 90,000 miles. However, it's important to note that this is just a general guideline and the actual replacement interval may vary depending on driving conditions and maintenance history. If you're unsure when the timing belt was last changed, it's best to have it inspected by a qualified mechanic.