Metal ore cooks more slowly than sulfur ore, while high quality metal ore takes longer again. Furnace speed, input slots, and the number of ovens all affect the finish time.
Choose the correct ore
Metal ore takes 10 seconds per item at base speed, sulfur takes 5 seconds, and high quality metal ore takes 20 seconds.
Split the load
More ovens and usable input slots reduce elapsed time. The calculator assumes the stacks are divided evenly.
Plan fuel separately
Electric furnaces need no wood. Fuel-burning ovens show the wood demand and expected charcoal for the calculated run time.