HI There!!  I need it so I can see what my tiny laptop screen is showing me.  It needs to be on the thin side (I know most of them are these days). Somewhere in the range of 22-36 inches would be my guess.  I need to be able to lift it on my own or have you help me so that's why I'm limiting the size.  Please reach out if you can help or think you can.  :)