Mr. Sherlock Holmes, who was usually very late in the mornings, save upon those not infrequent occasions when he was up all night, was seated at the breakfast table.
Arthur Conan Doyle, The Hound of Baskervilles
That was when I was a kitchen corporal.
Ernest Hemingway, In Our Time
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Dictionary
Merriam-Webster
— at what time
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Macmillan
— at what time or in what situation
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Usage
16 uses of ‘when’ in In Our Time, by Ernest Hemingway
372 uses of ‘when’ in Pride and Prejudice, by Jane Austen
146 uses of ‘when’ in The Great Gatsby, by F. Scott Fitzgerald
143 uses of ‘when’ in The Hound of the Baskervilles, by Arthur Conan Doyle