Shortest role to win an acting Oscar

Shortest role to win an acting Oscar
Who
Beatrice Straight
What
First
When
1976

Beatrice Straight (USA, 1914-2001) won the Best Actress in a Supporting Role award at the 1977 American Academy Awards for her portrayal of Louise Schumacher in Network (USA, 1976) - despite appearing on screen for a mere 5 min 40 sec.