I suspect with "hand-holdable" you mean not the simple act of holding them in front of the lens (which I find impractical, one should use the threads) but "will they prolong exposure so much that I need a tripod". That depnds on the light levels, doesnt it?
If you are using a camera with a built in light meter, the meter will provide you with the "correct" exposure setting with the filter in place. ...
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