Alsadius comments on Harry Potter and the Methods of Rationality discussion thread, part 17, chapter 86 - Less Wrong
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Actually, it spreads as an Airy disc, which gives it a radius of about 300 metres at the far side of the planet, and the effect is divided among all the souls it hits. If you hit a city on the other side of the planet, you just take a couple days off everybody's life. (The technical term is "statistical homicide")