Can I cook 2 loaves of bread at the same time?

It shouldn't effect the temperature too much - but I would take care to make sure there's room for both Dutch ovens comfortably. They can probably even touch, if needed - but if one is located closer to the base or rear of the oven and the other is towards the top or front, they may bake unevenly. If they both fit comfortably, try rotating the pans once or twice during baking!