Good points everyone.
I suppose until now, imaging from metro Adelaide, I find about 10 minutes is the max until I start getting sky glow. As for dark sites, I suppose 20 minute subs at f6 stems from previously doing 30 minutes subs with a DSLR at the native focal length of my ED120 (f7.5).
I just try to ensure I don't blow out any of the details or the star colours. A bit of trial and error.
I dare say there does come a point of diminishing returns in that going for the super long subs does not add much further detail.
Cheers,
Daniel
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