He will come back in five是( day time)还是(days'time)

He will come back in five是( day time)还是(days'time)
He will come back in five是( day time)还是(days'time)

He will come back in five是( day time)还是(days'time)
days' 我先的答案错了二楼的正确

five days' time

days'time
因为time是名词,则要用定语修饰,所以是days'time