Conversation so far:
What was Vaudeville?
vaudeville performer Rae Samuels, who had performed in shows with Robinson, convinced him to meet with her manager.
What was Robinson's role?
By 1912, Robinson was a full partner in the duo.
Did they see any success?
working as a solo act, increasing his earnings to an estimated $3,500 per week.

Question: How long did he perform solo?
Self-contained rewrite: How long did Robinson perform solo?