Conversation so far:
When was the golden age of comic books?
1938-1956
What was special about Sandy the Golden Boy?
He was the eventual successor of his mentor Wesley Dodds as Sandman
Who is Dian Belmont?
Aa fictional DC Comics character, associated with the golden age Sandman, a socialite and amateur detective, she assisted Sandman on most of his adventures as his aide and confidant.

Question: How long were they together?
Self-contained rewrite: How long were Sandman and Dian Belmont together?