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Depends.
The Snap On scanner we had allows you to perform tests in real time. However, we would often perform tests at various intervals. i.e, test it as it sits, take it for a drive, bring things up to temperature, test again, test after it sits for a prolonged period of time, etc.
If they're implying that they're waiting for their scanner to actually compute its findings, they're probably full of shit.
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Living in the United Socialist States of America.
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