我们在很多方面都被延误了，不知道需要多久才能赶上。
It has set us back in so many respects that I'm not sure how long it will take for us to catch up.
“我们当中没人知道我们将要在这儿呆多久。”—“我也不知道。”
"None of us has any idea how long we're going to be here."—"Nor do I."
“但你能在这屋里待多久？” — “不知道，这要看情况而定。”
"But how long can you stay in the house?"—"I don't know. It depends."
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