How Long Should an Oven Igniter Stay on

It should start the burner and stay on until it hits a designated temperature and then turns off.  It will go through cycles like this throughout the duration of the time.  When you make a bake or broil selection and set a temperature, that's when the igniter should start to glow and ignite the burner, the igniter should cycle off and on as the temperature increases and decreases, but will have a "reddish" glow to it, the complete cycle, until the control is turned off.  So because it is constantly being turned on and off throughout the cycle it may look like it is on the entire time.