The front screen light stays on for 10 mins at least. The mirror heaters don't have any visual illumination to say they are on, just the switch in the heat position.
Using VCDS you can reprogram the mirrors to only demist when the rear screen demist is on as well. That way, even if you leave the mirror switch on the heating symbol, it'll not overcook the element in them.
Mirror heaters seem dependent on model, euro 5 seems to be timed and once on will only turn off by itself but euro 6 seems to stay on and turn off when you twist the knob back but i stand to be corrected as only had an E6 as a courtesy so didnt test it out thoroughly
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