Plenty of people do "mega exposure" images, over several nights.
See some of the efforts of Brad Moore, Fred Vanderhaven etc (14-15 hour exposures etc), not to mention Rob Gendler who has cracked out some ridiculously long exposures..
Edit: But all these guys are using SBIG cams! not unmodded DSLRs.
In the end, the more data, the less noise. Go long.....
Turbo
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