I was incredibly careful the first few years that I had the kiln -- watching it like a hawk. But now I've even gone to a set-it-and-forget-it fusing schedule. And, I'm guilty of leaving the house to run errands if it's in a ramp down mode. But I have absolutely no problem leaving the dryer running and leaving the house. And, I've been known to turn on the oven to preheat when I'm running out to buy a frozen pizza. I guess I just like to live dangerously