I built a small simple wood fire kiln in my backyard that fits about 7 small pots. It is built similar to a Ken Olsen fast fire but it is much smaller and easier to fire. I decided to try a single fire and I am pleased with the results. It took 9 hours to get to cone 8 and I started with a wet kiln since it had rained the previous two days and the tarp fell apart letting in a lot of moisture.