"In how long" or "After how much time" are commonly used to ask about a future event or completion in Engpsh.
For example:
"In how long will the meeting be over?"
"After how much time can I expect the results?"
这是一种常用的询问时间的说法，表示你希望知道未来某个事件完成或结束的时间。
例如：
"会议什么时候结束？"
"我什么时候可以得到结果？"