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IN HONG KONG, summers are long. Brutally so. After more than a decade living inside the subtropical territory’s heat bubble, Andreas Lerchbaumer has learned to think of the season less in months than in minutes. “I call it the three-minute rule,” said Mr. Lerchbaumer, a 39-year-old wholesale distributor of German fashion brands in China. “If you don’t have air conditioning for 3 to 5 minutes, you might as well go home and change.” Anything longer than a smoke break out in the chicken-stew humidity will soak his cotton…