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Well at Gunnedah I assume you have reasonably dark skies so really accurate polar alignment and a decent wedge once again accurately aligned, 10 minute subs may be achievable, but it aint easy. I suggest experimenting what length of subs you get with round stars - I think that will be your limiting factor. In essence, 2 or 3 minute subs are fine as long as you take heaps of them and stack them. Good luck!
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