I am very interested in this 'minimalism' discussion. I will be travelling to Chile in March for 11 nights at Atacama Lodge. I plan to devote about 5 of the nights to astrophotography through an AT65EDQ/Canon60Da combination. (The other nights will be visual observing with the 24" dob while shooting wide-angle stills and time-lapses..)
There are waaaay more targets than I will have time for so I will have to compromise on S/N ratio by shooting some bare minimum of subs, flats, darks etc. ISO 1600 works well with my camera...
The big question is: How many subs is the minimum acceptable number? And how long should they be? Which would be better, e.g., 2x6min, 3x4min, 4x3min, 6x2min or 12x1min?
I have a 'wish list' of about 25 targets with the AT65 so, with my planned schedule, I'll do about 5 targets a night -- about 1.5 hours maximum per target. Whatever shall I do?
The brighter objects, like the Eta Carina Nebula, won't need as much exposure as the fainter objects.
Prioritize your list by which objects you really want the most, and then research how faint they are. Give more exposure to the faint objects.
Under true dark skies at altitude, you should get excellent results with shorter total integration times than at a typical observing location in North America.
You will typically need longer exposures for fainter extended objects, and shorter exposures for clusters.