Digital Camera (Cheap ones)

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[/size][size=78%]One thing that never seem to be quoted - the exposure time. Obviously is gonna be different on a digital camera, but I remember friends having things that would blur an image unless you stood perfectly still for 20 minutes.[/size]
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[/size]Any ideas how long a set of batteries last? I also remember digital cameras that would kill a set of AA's in 30 mins.[size=78%]