It’s not the belt that breaks, it’s the water pump seizing up, idler pulley seizing up or the tensioner failing that takes out the belt.
20yrs or 200k as long as you’re changing your engine coolant every 5yrs.
Engine coolant has a water pump lubricant in it, the lubricant wears out, the water pump bearings seize and takes out your timing belt. Everyone thinks it’s the belt that breaks, they are nylon belted just like tires, they do not break on their own.
What he said. I did mine and the belt looked fine, but the water pump had weeped some indicating that it was nearing end of life. They had about 10 years/80k on them.