First firing of my kiln

In the last couple of months I have been building a small kiln to fire bonsai pots and tea bowls at home. Last weekend the kiln was completed and tonight I fired it for the first time. The temperature in the kiln went up to 1180 degrees Centigrade in one and a half hours, which was higher than I expected. I could have achieved even a higher temperature, but I had no pyrometric cones for higher temperatures. I'll open the kiln tomorrow morning. I hope the pot is not cracked.