This has become absolutely absurd.
Is your position that the normal life cycle of the VW glow plugs is two months????? If not, then you appear to be telling the man the exact same thing that I am. And that is that premature failure of the glow plugs can occur if they are not functioning as designed.
I didn't say running them would burn out the glow plugs. I said, in my first post. "This MIGHT cause premature failure of the heating element in the glow plug." and in my second post, "If you add the heat of ignition to the heat of the electrical current acting on the element, you will reduce the life of the element......period."
Now, for some unknown reason, you feel the need to both agree and disagree with that position.
But this is a useless exercise and has gotten off the original topic. GSS asked "Is it bad for the glow plugs (or anything else) to start the tractor while they are still "lit"?
Dear GSS, the answer is yes. We don't all agree on what it will damage and some think it is not a big deal because the damage will take a period of time. But it is your equipment, not ours. So you get to choose if you "stop now or just do it until you need glasses."