Those shots were taken with a 40D on an ATLAS EQ-G mount and guided through a StellarVue 80raptor with a SSAG.
That shot isn't that difficult, maybe 4-5 hours involved. It's the nebula/galaxy shots that take so long(as if 4-5 hours isn't long enough). The process is basically the same, but the set-up is far more precise and data collection is between 8-15 hours alone.
The mount has to set-up to track the Earths rotation perfectly because the exposure times are between 5-50 minutes(average is about 20 minutes). The camera is a monochrome CCD so each color has to be taken individually: Luminance, Red, Green, Blue(LRGB) using the same exposure. So, if I take one LRGB series at 20 minutes that's a total of 2.6 hours per series.. to get sufficient data to gather detail/color I generally need at least 4 series, sometimes more... Generally the series spans over more than one night. Then I have to take dark and bias to subtract from each LRGB image. Data collection is complete: So now I have 4 shots in each color for a total of 16.. Each need to have dark/bias subtractions and each needs to be processed individually. Then I need to align and stack each color individually so I have one shot of each color(each shot is really 4 combined shots).. align and stack those.. then final process.
I hope that answers your question.