The Slow Equation of Friendship: 200+ Hours to a Close Bond

Two studies quantified how friendships form in hours: about 50 hours to move from acquaintance to casual friend, roughly 90 to become a regular friend, and more than 200 hours of shared leisure time to become a close friend. Bonds tend to form in bursts and can crumble when those bursts are interrupted, highlighting that close friendships require deliberate time investments and repeated, small commitments rather than waiting for a spark.