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Usage examples:

• It is now fifteen minutes of three.

  - "Grace Harlowe's Senior Year at High School or The Parting of the Ways", Jessie Graham Flower.

• What was she doing in this room fifteen minutes before you found my lady dead?

  - "A Terrible Secret", May Agnes Fleming.

• Sometimes his horses were put to and kept waiting for him twelve or fifteen hours at a time.

  - "The Memoirs of Louis XIV., Volume 9 And His Court and of The Regency", Duc de Saint-Simon.