Making close friends as an adult is hard, and science says it takes more time than most of us realize. The 11-3-6 rule of friendship has been making the rounds online as a kind of social shortcut, a way to quantify how much effort it actually takes to turn an acquaintance into someone you’d call when life falls apart. The idea pulls from research connecting friendship to happiness, longevity and mental health, and it lands at a moment when loneliness has become a public-health concern across age groups.
Here’s what the rule actually says, where it comes from and why experts think the quality o...
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