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3) All else being equal, then for the very faintest targets, the snr is proportional to exposure time T, but proportional only to the square root of the number of subs N. That means that for very faint targets, it will be hugely better to do ten 3600 second subs than 36,000 one-second subs. It will be better by a ratio of 3600 root(10) to 1 root(36000), or a ratio of six to one. Long subs rule.)
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However, 288000 one second subs would be equivalent, right? If you can't take long subs for whatever reason, just do more. It will just take longer overall and what's wrong with that? Really, long subs only rule if you count elapsed exposure time (and also assume zero failures in the capture process).
I'd prefer to get back to the practical issues for each person. How does one determine the best for their own setup. And if possible, I'd really like some of my questions from earlier posts explicitly answered. :p