Conversation so far:
What happened in 1914 for Bert Bell?
Bert Bell entered Penn in the fall of 1914 as an English major and joined Phi Kappa Sigma.
What did Bert Bell do at University of Pennsylvania?
In a rare occurrence for a sophomore, Bert Bell became the starting quarterback for Penn's coach George H. Brooke.
Did Bert Bell win games as starting quarterback for University of Pennsylvania as a sophomore?
Bert Bell temporarily shared possession of his quarterbacking duties until he subsequently reclaimed them later in the season, as Penn finished with a record of 3–5–2.
Did Bert Bell win any awards?
What was Bert Bell's greatest accomplishment?
As a result of Bert Bell's unit participating in hazardous duty, it received a congratulatory letter for bravery from General John J. Pershing, and Bell was promoted to first sergeant.

Question: How long did he stay there?
Self-contained rewrite: How long did Bert Bell stay as a first sergeant in the US Army?