I have four ingot molds, and I keep a piece of 4X4 plywood on the ground next to me. By the time I've filled the last one I dump the first. Then move on down the line until I'm done. It takes about 5 minutes for an ingot to cool where you can comfortably handle it with gloved hands. At that point, it's cool enough to throw in a 5 gallon bucket without a risk of melting it. Assuming, of course, you aren't smelting your lead to 1000 degrees.