instruction:
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.
question:
Sentence: Remembering the "we have some planes" remark, Boston Center guessed that Delta 1989 might also be hijacked.
answer:
How long was the Delta 1989 hijacked?


question:
Sentence: The use of non-covariant objects like pseudotensors was heavily criticized in 1917 by Erwin Schrodinger and others.
answer:
How long did Schrodinger oppose pseudotensors?


question:
Sentence: Alexander II's death caused a great setback for the reform movement.
answer:

How long did the effects of Alexanders death last?


