I have a Rowenta Professional Iron that does not shut off at all. I plug it into a Century mechanical timer that I can turn to anywhere from a few minutes to 12 hours and it will then turn off automatically. I love this system. My sewing room is in a separate building from my house so it is necessary it turns off if I forget. I usually turn it to 2 or 3 hours - or 1 or less.... and it does not turn off while I work to quilt or make stuff. So irritating when it does!! I do not like the digital timers as they are too cumbersome but the mechanical one is simple, easy, cheap and has never failed in past years I have used it. My husband came up with the idea! I'm a happy quilter! (and wife!)