It was not in Dorothea’s nature, for longer than the duration of a paroxysm, to sit in the narrow cell of her calamity, in the besotted misery of a consciousness that only sees another’s lot as an accident of its own.
There are no more uses of "duration" in the book.
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I take zinc tablets to help shorten the duration of a cold.
More frequent and longer duration exercise is associated with better health.