How many hours does it take to make a friend?

The question of this investigation is, how many hours does it take to make a new friend? Drawing from Dunbar's social brain hypothesis and Communicate Bond Belong theory, friendship status was examined as a function of hours together, shared activities, and everyday talk. In Study 1, MTurk participants (N = 355) who had recently relocated estimated time spent with a new acquaintance. Hours together was associated with closer friendships. Time spent engaging in leisure activities also predicted closeness. In Study 2, first-year students (N = 112) reported the number of hours spent with two new acquaintances three times over 9 weeks. Hours together was associated changes in closeness between waves. Two types of everyday talk predicted changes in closeness.