She would do the job in less than an hour. She would do the job within an hour. If it was not rare that it took her less than twenty minutes to finish it, which sentence above would be better?
Top answer
She would do the job in less than half an hour. She would do the job within half an hour.
— Mister Micawber
She would do the job in less than half an hour.
She would do the job within half an hour.
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You have changed your terms; they are too complicated and you should recast your sentences to reflect those parameters. Otherwise, the 2 structures remain equally acceptable.