Thanks! I would have surmised that solar fire starting would have been considerably more difficult after 3 and before 10.You make a good point about long term versus short term situations. I might add that it is easyto keep a fire going, once lit. Camping overnight, a bit of fussing with the coals from the evening fire will heat up the morning coffee without further use of matches. Once deep in the Sonoran desert, we built our fire with Ironwood. The next morning the coals were still perfect for cooking-even easier than flipping a switch!