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no they have a bulb setting that allows you to take as long a shot as you wish, from what I can see there are folks with unmodded bog standard dslrs taking good shots of half an hour , sure there will be noise that can be eradicated or reduced with darks etc but their results are good.
I did a few 30sec shots on m42 , they were great the fov compared to my ccd's is amasing but I need more data for dimmer objects and you can only get away with telling your mates "this is a close up of the horse head neb without the horsehead" so many times
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