A:Answer It depends on many factors. By default, our products are set to motion record, meaning they will only record when the cameras sense motion within the detection area. How long it takes the microSD Card to become full depends on the environment where the camera is installed and how much traffic it detects. In the type of environment you described, the microSD card will fill up quickly, within 24 to 48 hours. Please view your products support page at the following link, should you need more information: https://support.nightowlsp.com/hc/en-us. Thanks for choosing Night Owl!