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I think the key here is that there's some trade-offs and you need to balance those in accordance to your situation.
For me it's a matter of trying to identify "optimal exposure time" such that with an equal integration time, the SNR will be just as good as if you'd done longer exposures.
Once you can figure that out, don't go over it because you're just putting each exposure at a higher risk of being discarded due to events such as wind and tracking errors.
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