I have clay that has been through the initial firing and now has glaze applied. It needs to be fired a second time. I researched glaze and clay type/brand and found that the clay and glaze require cone 6. How do I know how long to fire the clay for? How many hours do I leave the kiln on? Obviously I have never done this before but need to get the clay fired within the next two weeks. I had initially hired and paid a company to do it for the school but they refunded the money and said they are no longer helping with groups. I found a kiln but the owner has never used it and I have never used a kiln so now that I know the cone, I need to know the time. I made sure there is no glaze on the bottom of the clay so that it wont stick to the kiln. Any tips are appreciated!