She didn't come here an hour ago.
She has been here for no more than one hour.
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She has just been staying here for a moment ，less than an hour。
She has just come to here staying less than an hour。
It has been no more than an hour after she got here.
She has been here for less than an hour.
She has not been here for one hour.
It's less than 1 hour since she came here.
She has been here less than one hour.
It's less than one hour since she came here.
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