Conversation so far:
what was A.
C.
Bhaktivedanta Swami Prabhupada's religion?
In 1933 he became a formally initiated disciple of Bhaktisiddhanta.
what was his training like?
In 1922, when he first met his spiritual master, Bhaktisiddhanta Sarasvati Thakura, he was requested to spread the message of Chaitanya Mahaprabhu.
did he spread the message?
he started the publication called Back to Godhead, for which he acted as writer, designer, publisher, editor, copy editor and distributor.

Question: how long did the publication last?
Self-contained rewrite: How long did the publication of Back to Godhead last?