用's 来修饰这个时间time,你可以说in two days.
下面是国外语法的解释,希望对你又帮助。
Use apostrophes in phrases such as in two days' time, 12 years' imprisonment and six weeks' holiday, where the time period (two days) modifies a noun (time), but not in nine months pregnant or three weeks old, where the time period is adverbial (modifying an adjective such as pregnant or old)
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