Time for a new chain.
As Steve25 pointed out, you can check the total amount of slop in the chain and your camshaft timing will be retarded 1/2 of that amount.
For example, if there is 15* of slop, your camshaft is running 7.5* retarded.
10* of slop = 5* retarded.
No matter how far it is stretched, it will definitely affect the engine performance in a negative way.
Good luck!
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