Conversation so far:
What did Richard Stallman do at Harvard?
As a first-year student at Harvard University in fall 1970, Stallman was known for his strong performance in Math 55.
What did he do at MIT?
In 1971, near the end of his first year at Harvard, he became a programmer at the MIT Artificial Intelligence Laboratory, and became a regular in the hacker community.
What else did you find interesting in this section?
Stallman received a bachelor's degree in physics (magna cum laude) from Harvard in 1974.
Was he well liked at MIT?
CANNOTANSWER.

Question: How long was the MIT tenure?
Self-contained rewrite: How long was Richard Stallman's MIT tenure?