Use keyframes applied to the Force parameters of Shatter.
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Andrew is right about using keyframes to animate the properties of the effects.
Another approach is to apply the effect to an adjustment layer and trim the adjustment layer to the desired duration. See this page, which links to a tutorial specifically about this. Actually, that's also linked to from the page that gives an overview of working with effects. (Hint, hint.)
Yet another approach is to split the layer and apply the effect to one instance but not the other.
I thought key frames would be the easiest way, but when you add a pre-packaged effect, the key frames are not visible. is there someway to turn them on?
I mean, when you modify an effect, I know you can add keyframes but the stock effect doesn't seem to show them.
If you want to see keyframes on a layer, select the layer and press U. That information is on this page in After Effects Help.
I think that you would get a lot of benefit from working your way through the getting-started materials here:
Todd, thanks, I saw that on the tutorials but when I click U, I just get the arrows rolling up.... it closes the open parameters.
> when I click U, I just get the arrows rolling up.... it closes the open parameters.
It should close the open properties except for the ones with keyframes.