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A study says "it takes about 50 hours of socializing to go from acquaintance to casual friend, an additional 40 hours to become a 'real' friend, and a total of 200 hours to become a close friend." https://www.theatlantic.com/magazine/archive/2018/09/how-to-make-friends/565742/
@estherschindler
And then you have swedes where you can add 250% to those numbers.