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ikrase comments on Harry Potter and the Methods of Rationality discussion thread, part 19, chapter 88-89 - Less Wrong
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As far as I can tell, transfiguration mana requirements are based on the size of the assumed form, and there can be a huge size change (such as a 20 kg? rocket from a small ice cube taking a long time) and the very easy partial-transfiguration slicing.
Harry doesn't need to keep the rock at all times. He just needs to contact it more often than once every transfiguration duration.