The timing chain can technically go on forever even very high mileage. It has a hydraulic tensioner/other parts which if worn can be replaced. But if you get to that point I would be renewing the chain assembly completely.
As others state the warning signs will be a rattle/metallic noise.
Extremely important to change the engine oil and filter as per service recommendations.
But I and many others do that annually regardless of mileage.
I researched that subject in 2016 when I bought mine and could find no instances of one breaking. (Still can’t).