Teacher: 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.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Sentence: Jack played basketball after school, after which he was very tired.
Solution: How long did Jack play basketball?
Reason: the question asks about the duration of an event; therefore it's correct question.

Now, solve this instance: Sentence: After earning bachelor's and master's degrees in education and a few years teaching, Kilgore enrolled at the UM law school.
Student:
How long did it take to earn a bachelor's degree?