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Usually, the longer your exposure, the better your SNR (Signal to noise ratio). That said there is a point of diminishing return under very light polluted skies. The challenge is to extract your faint data from the background sky glow. Don't worry too much about what you see in your raw as far as light pollution goes. You can always stretch and level your histogram to bring back a darker background. See attached. The more subs (data) the easier it will be to process.
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