How long are you going to stay here?你要在这里停留多久

今天的几个句子是有关旅行的：1. What's the purpose of your visit? 你旅行的目的是什么？2. Could you please give me the departure time? 你能告诉我出发时间吗？3. When would you like to return? 你打算何时回来？