Following tests in software and with small models, I concluded that it did NOT have as long of an unattended time as I had hoped for. When I looked down on the model, with a red ball to represent the cooking pot, I could see areas with no red reflection, left and right of my view point. So If my eye was replaced by the sun, it would mean that the sunlight hitting those areas MISSED the target. The obvious conclusion (and one that few people have made) is that simply spinning a curve and making a dish is incorrect if you want unattended cooking. I have shown myself the problem using laser pointers too. (It does not transmit well to pictures).