All of my long exposures are 10 minutes to 3 hours long. So when you say "shutter speed" you're thinking of speeds like 1/8 second instead of 1/2 second? In that case yes it's faster simply because it's 2 stops faster speed film (well that's debatable, it seems to me to be more like EI 200, but that's a whole can of works I don't want to get into). But is that what you mean?
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