"Advent Calendar", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License
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I think you could get up to about 11:59:57 before you'd have trouble swallowing the chocolates fast enough. At that point, you'd need some kind of a liquify-and-chug apparatus to get up over the 11:59:59 barrier. Anyway, Merry Christmas!