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It is hard to tell you a solid time for when they "return"
Without knowing the specific logic for turning on the CEL in your car, generally certain conditions must be met for the diagnostic to pass/fail which may include the engine coolant warming up a certain amount, the car being on for a certain amount of time, etc.
Also, if the sensor isn't hard failing and is intermittent failing then it may make the CEL take even longer to set.
In general, any emissions related diagnostic trouble code will set a CEL on the first fail as emissions is the reason OBD was invented.
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