This depends on the hard disk in the hard disk video recorder. A lot now, at least 1TB.

But also related to the number and pixels of your camera.

I can only give you 1 example.

Our company's own monitoring equipment, 5 12GB hard disk, can store nine cameras with 480W pixels for one week.

Of course, some companies set the daytime video in the hard disk camera to be saved for 2 weeks if it is not saved.