I finished shredding yesterday, last falls garden debris along with grass clippings, a few leaves, all the annual flowers, 11 hanging baskets, about 15 rotting pumpkins and 4 bundles of corn with ear corn attached. I thought I would have enough shredded material to fill one of my 3 X 3 X 3 bins and was planning to add some urea to get it to heat up. This morning, about 36-38 HRS after I started shredding, I was going to build my compost pile. To my surprise there was steam vapor coming off like crazy. I think I was grinning from ear to ear. Now I am planning on letting it set until it cools to about 120 DEG then add some urea and fill my bin.