Conversation so far:
Who was Hedy Lamarr's first marriage?
Hedy Lamarr married Fritz Mandl in 1933.
What happened during Hedy Lamarr's marriage with Fritz Mandl?
Hedy Lamarr described Fritz Mandl as an extremely controlling husband who prevented her from pursuing her acting career.

Question: How long were they married?
Self-contained rewrite: How long were Hedy Lamarr and Fritz Mandl married?