Teacher:In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Teacher: Now, understand the problem? Solve this instance: Context: Becker clerked for Judge Link Information: He served as Chief Judge and as a member of the Judicial Conference of the United States from 1979 to 1992. He assumed senior status on January 7, 1992. His service was terminated on April 29, 2007, due to his death.

Question: How long did the person Craig clerked for serve as a judge?
Student:
Answer: 28