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.

Ex Input:
Sentence: Alexander the Great's accomplishments and legacy have been depicted in many cultures.

Ex Output:
How long did Alexander the Great reign?


Ex Input:
Sentence: Portuguese explorers then embarked upon Macau (now Macao), the Congo, and various other parts of Africa, including the Sudan.

Ex Output:
How long did the Portuguese explore?


Ex Input:
Sentence: The origin of the funds remains unknown, although we have a general idea of how al Qaeda financed itself during the period leading up to 9/11.

Ex Output:

For how long was al Qaeda financing itself?


