Study reveals number of hours it takes to make a friend: roughly 50 hours of time together for casual friends, 90 hours to go from that stage to simple "friend" status & more than 200 hours before you can consider someone your close friendhttp://phy.so/441533233
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If you spend enough time with a person to consider them a colleague, would not that time “count”?
I meant 'colleague' just in the sense of working in the same academic department...