The trick is to shoot just what you have to. There are more targets there than you need for gold...if you stick around and shoot every last building and ground dude, you'll run over your time limit. There are only a few buildings at the two factories that absolutely have to be blown up (plus the bonus bunker.) Also, once you've gotten the advanced blasters at Taloraan, your speeder will have enough firepower that you can take out the radar installations at full speed, which saves more time.
Was that more helpful?
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"I sought the true nature of reality but discovered instead the real nature of truth."
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