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The clip length can be adjusted in camera's recording settings: Device Settings > Storage & Recording > Enable Local Recording, then you will see the Clip Settings option.

As a battery-powered camera, Tapo C460 needs to wake up first before it starts detection and recording. Most of the time, it stays in sleep mode to save battery. This article will give you a clearer understanding of how this type of camera operates and how to improve its detection performance. Hope it helps! How to Install and Configure Battery-Powered Cameras for Optimal Detection Performance