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The traps can be changed every 6 to 12 months . It may take about 6 to 12 weeks for the fistula to form . Fewer than 16 percent of children age 6 to 12 are estimated to be enrolled in school . The mountains along the Tennessee-North Carolina border could pick up 6 to 12 inches by early Sunday . The major feedbacks emerge from stock price changes to growth within the first 6 to 12 months , but we show that significant feedbacks may last for up to two or three years .