Hello. You mean the timer until it should switch off? The appliance has to run, then you can set the number of hours it should run on the timer. But yes, I am not completely satisfied either. I have to send it in because the sensor is broken. And actually the fan keeps running even when the timer has run out. The compressor is then off but the fan is always on. It's a shame, because the shape and manageability would be good.