"People ask me,' How long did it take you to write that book? ' The answer is,'Sixty-eight years.'" The book consists of 600 essays by Milner - some done in consultation with other experts in the many fields shaped by Darwin's thinking ." .

VOA: standard.2009.11.25

How long did it take old Chopin to think that up do you suppose? Two seconds?

老肖邦花了多长时间去构思这段曲子,你觉得呢,两秒钟吗

耶鲁公开课 - 聆听音乐课程节选

You told me that you've written plays by yourself. How long did it take you to finish them?

你告诉我你自己写剧本。写完一个剧本要多久呢？

灵感从何处来 - SpeakingMax英语口语达人

How long did it take you to come here?

你到这儿花了多久？

How long实战 - SpeakingMax英语口语达人