instruction:
In this task, we ask you to write an answer to a question that involves “event duration", based on a given sentence. Here, event duration is defined as the understanding of how long events typically last. For example, “brushing teeth”, usually takes a few minutes. Note that a lot of the questions could have more than one correct answer. We only need a single most-likely answer. Please try to keep your "answer" as simple as possible. Concise and simple "answer" is preferred over those complex and verbose ones.
question:
Sentence: About 30% of Ratners's profit already is derived from the U.S. 
Question: How long did it take to make profit?
answer:
3 months.


question:
Sentence: He was asked to lend his support by writing a letter, with Szilard, to President Roosevelt, recommending the U.S. pay attention and engage in its own nuclear weapons research. 
Question: How long did it take him to write the letter?
answer:
15 minutes.


question:
Sentence: She told me that she was heading for a drink and slipped out of the crowd. 
Question: How long was she at the bar?
answer:

2 hours.


