There’s no easy answer since the oven temperature is entirely dependent upon weather conditions. Solar ovens seem like a natural choice for remote backpacking trips, but they take longer to cook than other types, so you must arrive at your destination with plenty of time to spare if you plan to use this type of portable oven. In general, solar ovens take 1.5 to 3 times longer to cook than a traditional oven, assuming abundant sunshine. If you’re hiking in the mountains, be sure to set your oven up in an open area where peaks won’t cut your daylight even shorter.