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 Q]: Sentence: She told them that she would help take care of the puppy, if she could have one.
[EX A]: For how long would she care for the puppy?

[EX Q]: Sentence: Natural Levees A flooding river often forms natural levees along its banks.
[EX A]: How long does it take for a river to form?

[EX Q]: Sentence: I clapped her shoulder to show I was not laughing at her.
[EX A]:
How long did they laugh?

