Conversation so far:
What was Joseph Rotblat's take on nuclear bombs?
Joseph Rotblat continued to have strong reservations about the use of science to develop such a devastating weapon.
Why did Joseph Rotbalt have strong reservations about The Manhattan Project weapons?
Joseph Rotbalt was shocked to hear the director of the Manhattan Project say words to the effect that the real purpose in making the bomb was to subdue the Soviets.
Did Joseph Rotbalt teach his views on atomic research?
Joseph Rotblat gave a series of public lectures in which he called for a three-year moratorium on all atomic research.

Question: How long did he teach?
Self-contained rewrite: How long did Joseph Rotblat teach?