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It is very useful to keep a firing log. Start your log entry by describing how the kiln is loaded (types and sizes of items, density of packing.) You will find that the more densely the kiln is loaded, the longer it will take the kiln to reach the appropriate temperature. You will learn how to adjust for this with your particular kiln. Typically you will add a longer soak at the top temperature when the kiln is more densely packed.