Who defined the short story as a narrative that can be read in one sitting?

The definition of the short story as a narrative that can be read in one sitting is attributed to Edgar Allan Poe. He is often recognized for his comments on the nature of short fiction, emphasizing the importance of a singular effect that can be achieved in a brief format. Poe argued that a short story should focus on a central theme and create a unified emotional experience for the reader within a concise space. His insights laid the groundwork for how short stories are crafted, highlighting their ability to deliver a powerful impact in a limited time, which is essential for the genre. This makes him a pivotal figure in the study and appreciation of short stories.