You will be given a definition of a task first, then some input of the task.
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.

Sentence: In Malaysia, Powell met with Prime Minister Mahathir Mohamad, who has led the country since 1981. 
Question: How long did Powell take to travel to Malaysia to meet the Prime Minister?
Output:
4 hours.