This paper delves into the rapidly progressing 15-Minute City concept, an innovative urban planning model that envisions a city where residents can access essential services and amenities within a 15-min walk or bike ride from their homes. Endorsed by UN-Habitat as a critical strategy for sustainable urban regeneration, this concept has gained considerable worldwide recognition since its introduction in 2016. The 15-Minute City framework aims to enhance accessibility, sustainability, and social cohesion by emphasizing mixed-use development, compact urban design, and efficient transportation systems. Nevertheless, the swift expansion of this concept has surpassed the production of academic literature on the topic, leading to a knowledge gap that calls for alternative research methodologies. To address this gap, our paper adopts a mixed-method approach, systematically analyzing the scholarly literature, gray literature, media articles, and policy documents to offer a holistic understanding of the 15-Minute City concept, its real-world application, and the primary principles embraced by policymakers. By investigating the various manifestations of the 15-Minute City model and its potential advantages, challenges, and implications for urban planning and policy, this paper contributes to the ongoing conversation on sustainable urban development and planning. Through this study, we aim to inform policymakers, urban planners, and researchers about the current state of the 15-Minute City movement and its possible future trajectory.