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Stacking will only give a better signal to noise ratio. If you have 30 images of 30 seconds stacked, you still only have 30 seconds of signal, but your noise will decrease.
If you have 1 image of 30 minutes, you will have a heap of detail, but possibly high noise (depending on hardware).
So no, stacking won't give similar results, stacking is only used to improve the signal to noise ratio.
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