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It's very easy to check Greg.
Assuming slow readout, just look at the sky background in one of your subs - (lum, RGB, Ha, whatever and on any of your scopes) - and if it is much less than 600ADU + biasADU then you could use longer subs. If the sky is much greater than 600ADU + biasADU, then you could reduce the sub length without noticeable penalty.
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