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For your information, NGC253 is the Sculptor galaxy and i get it in 20 second shots.
The Helix nebula is another beast and is very faint mag 7.3
I think you would be able to get NGC253 mag 7.3 from Werribee although very faint because of the light pollution.
The best time to watch it is when it is fairly high.
NGC55 is magnitude 7.8 so a bit dimmer than NGC253.
These mags dont say much because you also have to consider surface brightness (this means the light spread over the object).
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