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.

Example Input: Sentence: This approach has been echoed by Lev Landau and Evgeny Lifshitz, and others, and has become standard. 
Question: How long did it take to become standard?
Example Output: 2 years.

Example Input: Sentence: Durer rejected Alberti's concept of an objective beauty, proposing a relativist notion of beauty based on variety. 
Question: How long did it take Alberti to form his concept of objective beauty?
Example Output: 5 weeks.

Example Input: Sentence: He accents the illusion of reality --I paraphrase his entry in La Enciclopedia Humanica --by doing life-size scenes in "The full round," never the easier frontal or three-quarters view. 
Question: How long did it take him to develop his unique style?
Example Output:
eleven years.

