As you can see by the size of my compost pile it has absolutely exceeded the critical mass point, usually seen as 1 cubic yard (3'x3'x3'). I have 6 pallets placed in the corner of the yard against a chain link fence. At least once a week I turn half the pile and add a few more bags of yard clippings. As of this morning the temperature inside the pile was over 140*. I hope to use this compost in 6-8 weeks to build some lasagna gardening beds.
Tips: Check bags for pine cones, sweet gum balls, and magnolia leaves or seed pods. These do not go well in a compost bed, but may be found in yard waste.