[Threshold]

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Originally Posted by JesterlJoker he could just basically not let the timer repeat itself after a certain interval same thing as killing it

That would just be considered letting the timer complete its purpose. That isn't killing the timer. If you were to set a timer that didn't repeat, you would still need the timer ID if you were to kill it before it was executed. Letting the timer be executed and not be repeated wouldn't be considered killing the timer and requires no interaction anyway.

Timer IDs start from 1 and continually increment, but timer IDs are never reused, so each timer that is ever set has its own unique id.