Conversation so far:
How did the critic Robert Hughes get started in his career?
The critic Robert Hughes, an aspiring artist and poet, abandoned his university endeavours to become first a cartoonist and then an art critic for the Sydney periodical The Observer.
What did the critic Robert Hughes do after working as an art critic for The Observer?
The critic Robert Hughes settled in London in 1965 and wrote for The Spectator, The Daily Telegraph, The Times, and The Observer, and contributed to the London version of Oz.
How long did the critic Robert Hughes work for Time magazine?
At some early point in his long career, more than three decades of it spent at TIME, Robert Hughes became the most famous art critic in the English-speaking world.

Question: What did he write for them?
Self-contained rewrite: What did the critic Robert Hughes write for Time magazine?