Conversation so far:
What was Elizabeth Blackwell like as a child?
Elizabeth Blackwell had a governess and private tutors to supplement her intellectual development. As a result, she was rather socially isolated from all but her family as she grew up.
did Elizabeth Blackwell get an education in college?
Elizabeth Blackwell received a medical degree from Hobart College, then called Geneva Medical College.
What can you tell me that is a significant about Elizabeth Blackwell's early adulthood?
The sisters Anna, Marian and Elizabeth Blackwell started a school, The Cincinnati English and French Academy for Young Ladies.
Who did they teach at school The Cincinnati English and French Academy for Young Ladies?

Question: How long did she teach at this school?
Self-contained rewrite: How long did Elizabeth Blackwell teach at The Cincinnati English and French Academy for Young Ladies?