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I normally try to get around 1000 frames for stacking....
With my double stacked SM60 and x2.5 Powermate I need exposures of around 1/120s for the surface features...so this gives about 10sec in total; for the proms I need down to 1/11 sec exposure and this can cause problems with fast moving edges of the proms.
General answer.... a few seconds....
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