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I have noticed the same thing, 30min to 60min worth of exposures is the sweet spot, after that the difference / improvement is subtle. As for single subs I expose for the background, to not let it get too bright. For me in Mackay it's 2min at iso 1600, unmod canon 1100d.
A few more darks might help with the noise I try and use about 20, I have a dark library and reuse previously shot darks.
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