You're fine. The amp itself won't kill the sub - typically, woofers fail by reaching their excursion limit (bottoming out), not by overheating (with better materials and venting). You'll know if you're killing the woofer.
At 600W, if you're in the car, I believe you'll have a hard time bottoming the sub while you're in the car (if you value your hearing). Get outside and turn it up - that's another story; be careful.
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