Conversation so far:
What did Robert Crumb do in 1962?
Robert Crumb's father gave him $40 when he left home after high school.
What did Robert Crumb do when he left home after high school?
Robert Crumb's first job, in 1962, was drawing novelty greeting cards for American Greetings in Cleveland, Ohio.

Question: How long did he do that?
Self-contained rewrite: How long did Robert Crumb draw novelty greeting cards for American Greetings?