I really don't believe in all these studies and their results. If people have not developed friendships in all their years of existing then they don't understand what it means to be a friend. This is a sad commentary on society. Putting two incompatible people in a room for 500 - 2500 hours is not going to make them friends. Friendship is something that cannot be forced. I have had the unfortunate experience of being exposed to arrogant individuals who were so jealous of my friendships and my ability to keep retain friends for years that they forcefully pitted us against each other and ruined what I had. I believe these individuals who ruin friendships are just devious, envious, sadistic bullies. Friendships develop naturally on their own with innate nurturing. You cannot push anyone into it.