Pat,
I run 10 minute LRGB exposures with my ST-2000XM (different completely to the QHY10) in town lighting. I find that sometimes isn't enough. H-a is a minimum 20 minute exposure.
When doing M42, I do 10 minute LRGB, followed by a 3 minute run just for the Trapezium, then combine the 2 sets.
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