In contrast, Anthony Hopkins earned his first Best Actor Oscar, for The Silence of the Lambs, with 20 minutes of screen time.

Then there’s the anomaly of the Supporting Acting categories.

Usually, the Best Supporting Actor and Best Supporting Actress awards go to performers who are given so much screen time that they’re practically a lead.

For example, Mahershala Ali won his second Best Supporting Actor for Green Book, despite having over an hour of screen time, and essentially co-starring with the designated lead, Viggo Morenstern.

But some actors have clinched those awards with 15 minutes on-screen.

And, as noted, it’s even more astounding when an actor wins a leading-role Oscar with that amount of screen time.

David Niven in Separate Tables: 15 Minutes

David Niven won his only Best Actor for his turn in the 1958 drama Separate Tables, in which he has just 15 minutes of screen time. 

Niven’s scarce runtime is due to the story’s sprawling structure. Based on  Terence Rattigan’s one-act plays, Separate Tables centers on half a dozen characters staying at a seaside hotel in Bournemouth.

Niven had made a career playing the kind of suave, debonair gentleman that his role in Separate Tables as Major Pollock, accused of sexual molestation, was a departure from the norm, which caught the voters attention.

Anne Hathaway won Best Supporting Actress Oscar for her turn as Fantine, a struggling factory employee who resorts to prostitution in order to provide for her daughter, in Tom Hooper’s 2012 film adaptation of Les Misérables.

Hathaway earned the award with just 15 minutes of screen time, in a movie whose runtime is over two-and-a-half hours.

Hathaway cut her hair for Les Misérables, indicating serious commitment to the role. While Russell Crowe was criticized for shaky singing, Hathaway’s singing was praised, and her rendition of “I Dreamed a Dream” was a showstopper.
It also helped that she was a known quantity to Oscar voters, having been nominated for the 2009 Best Actress in Jonathan Demme’s Rachel Getting Married.

Penelope Cruz, Vicky Cristina Barcelona: 15 Minutes