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well, its a balance bettween longer exposures and stacking. To do good imaging with a DSLR, really, stack 5 min exposures (in urban skies), the more the better, thats the go. Anything much less than 5 min subs for DS is just temporary progress. Stacking really short subs is just hard work, you need to overcome read noise with longer exposures. I see many ppl making tiresome incremental improvements with short exposure times/huge stacking and just tracking, get the fundamentals right (polar align and guiding, do it now, dont waste time) and youll be supprised at the results.
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