Oh my! I have not done this exact thing but have boiled milk over the pan to make a nice mess. Now, I do not allow myself to walk away because I never remember to come back until too late or like others, I set a timer and carry it with me. (Those glass top stoves have pros and cons but I don't think I would ever buy one again. Yes, it will be expensive to replace ... sorry for your loss!) Once I was filling our horse trough at around 7:00pm. The next morning my DH came in after going to the barn and asked when I had turned the water on. I went running too. At least the well did not go dry ... we did have a great well in that house ... but the pasture was awash in water and took a few days to dry out.