How long will 1-4 tb hard drive record continuously for 4CH 720P/1080P?

Main Features 1.Our New 5MP POE Camera System, 8 Channel NVR Design, Support To Connect Up To 8pcs Cameras, You Can Buy Techage POE IP Cameras To Expand Your CCTV System.2.It Can be Extended to 16pcs 5MP POE Camera if use 8CH POE Switch...

4K 8.0MP Ultra High Definition and Color Night Vision Four times the resolution of 1080P.This Ultra HD 4K CMOS Image Sensor allows the camera to capture more light,which improves color,contrast,and low-light performance.In 4K resolution.Record everything with sharper details with the high Pixel count and...

Real-time Two-way Audio Communication Camera Has Built In Microphone And Speaker. Never Miss a Moment With Your Family. Smart Ai Motion Detection and E-mail Alert When It Motion Detect , The 2pcs White Leds and Red-Blue Alarm Will Light Serve As a Warning and...

  HD 5MP Resolution Ideal for home or business 5MP offers exceptional Full HD resolution and quality enhancing efficiency and monitoring capabilities.  Two-Way Audio & Audio Record You will get a camera with true sound reproduction in order to record important sound evidence. And...