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两句意思相同。 He will be back in ten minutes. 较短,较口语化,较常用。 He will be back in ten minutes' time. 不常用,较书面。 正像汉语中,“你吃了吗?” 和 “你吃过饭了吗?” 意思完全相同。 I will be with you in one minute's time is correct English. Thus there must be an apostrophe + s in the singluar. So, for the plural, there will be an s + an apostrophe. I will be with you in ten minutes' time.