Never, it is designed to last the life of the engine and is normally replaced when the engine is overhauled.
You will never need to. It will out last the truck it's self.
A 2000 Chevy S10 does not have a timing belt.
It has a timing chain for sure.
It does not HAVE a timing belt. It has a timing chain and it will most likey last the life of the engine.
timing chain
It has a timing chain and gears.
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The 2000 Chevy Trail Blazer doesn't have a timing belt.
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The timing is set on a 98 Chevy Silverado 1500 5.7L by aligning the cam sprocket with the timing chain markings. The engine's computer will then make adjustments on the fly for any additional timing changes needed.
It does not have a timing belt. It uses a chain.