No, with steeping grains that's not usually much of a concern. They only have so much color and flavor to give, though, so anything over 20 minutes probably isn't worthwhile. Kind of like making tea with a teabag- once the flavor of the tea is extracted, there really isn't much of a point in continuing to steep.
In a partial mash, you're using base grain which must convert, so a longer steep (mash) is done (usually 45-ish minutes).
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