TASK DEFINITION: In this task, we ask you to write a question that asks about "event duration", based on a given sentence. The question will likely start with "How long". Your question should be answerable based on the common knowledge of how long certain events usually last. Don't create questions which have explicit mentions of answers in the text. Instead, it has to be implied from what is given. In other words, we want you to use "instinct" or "common sense". Note that the written questions are not required to have a single correct answer.
PROBLEM: Sentence: Boston Center TMU [Traffic Management Unit], we have a problem here.

SOLUTION: How long had the problem been occuring?

PROBLEM: Sentence: He ordered the evacuation of al Qaeda's Kandahar airport compound and fled- first to the desert area near Kabul, then to Khowst and Jalalabad, and eventually back to Kandahar.

SOLUTION: How long did the evacuation of the airport take?

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.

SOLUTION:
How long is the air in your lungs?

