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I agree with Ray's original point that total integration times do not directly correlate with the same SnR across different systems and locations. A 12" scope has over twice the aperture (area) than my 8"... so all else being equal, 20 hours for someone else may be similar to 45 hours for me.
However, if you look at the subset of people who actively aim to go really deeeep, produce images that elicits "wow" reactions, gets APODs, and so on, things start to look very similar: mag 21-22 dark skies, 100 - 130 mm refractors for nebulae, 12" reflectors with appropriately matched pixel sizes for galaxies, Astrodon/Astronomik/Baader/etc filters, 11000 / 16803 / 694 chips are all pretty common.
In this case, comparing 1 vs 10 vs 50 vs 100 hours does give a rough idea of what to expect.
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