That's true, the overheat message comes on as soon as there is a chance to damage the engine. A little bit of overheat however has a very small chance to damage the engine at all.
If you fly full power / max. pitch with radiator open in high speed level flight, you can probably fly for a long time before anything happens.
You shouldn't sit on the runway having the engine maxed out, it's going to blow fairly quickly.
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