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Yes, as long as you shoot at around ISO 3200 then 15secs@f3.5 should give you good detail on a moonless night. So as an example, if you shoot for 12 hours, say 7.00pm until 7.00am, with a 40 second interval, you will capture 1080 frames: 12hrs X 60 X 60 = 43200 seconds. 43200/40 = 1080. Now @ 24fps your time-lapse will run for 45 seconds. If you choose 15fps , the time-lapse duration will be 72 seconds, not as smooth but still very watchable. It really depends on whether you want quantity or quality.
Personally, I'd use 24fps because 45 seconds is quite long enough to maintain the viewers interest and the result will look smoother. Do you shoot in AV priority so the camera can compensate for the fluctuating light conditions? That way, your sunset and sunrise transitions will be exposed correctly.
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