I usually wait for the pile to cool down/stop steaming before turning it and then I water it when when I turn it. Which is about once every 3-4 weeks in the summer. Different microbial communities require different temperature ranges so by turning it too often you disrupt the high temperature community. If you are worried about oxygen getting into the pile you can stick a stake into the center, wiggle it around and pull it out to make a chimney hole that will increase air flow through the pile a little. Hot air rising up the chimney will pull air in through the sides.
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