My older sister told me that it must be done 21 times, but I want to see what other society think, too. Thanks!! :]

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Answers:    I enjoy a book about living in good health, and one of the chapters is titled "28 days make a habit....for better or worse"
From the title, as you can guess, it's around curbing bad behavior efficient, before it become habit, and in the region of keeping up your willpower just long ample to create good traditions.

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