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I'm an introvert. My husband is an extravert. Guess who has more friends. And after reading this, it just makes more sense:
The lead researcher on the project identified three levels of friendship: casual friendship, regular friendship, and close friendship. It takes a certain number of hours spent together to reach each of those levels; 40 to 60 hours for a casual friendship, 80 to 100 hours for a regular friendship, and more than 200 hours for a close friendship. This also explains, to some degree, how friendships can be made easier while younger. College students, for example, can spend many more hours in a shorter time period together, while adults post-college have other responsibilities and probably don't live in the same room or building.
Spending quality time with your pals, going on vacations together, and even taking time to dish about your favorite podcasts can keep your bond healthy and strong.
(MarthaStewart)