Detailed Instructions: 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.
Problem:Sentence: When you inhale, air enters the respiratory system through your nose and ends up in your lungs, where gas exchange with the blood takes place. 
Question: How long is the air in your lungs?
Solution:
less than a minute.