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A University of Kansas professor has defined the amount of time necessary to make a friend and how long it typically takes to move through different stages of friendship. 近日，美国堪萨斯大学的一位教授定义了交友所需的必要时间，以及发展至友谊不同阶段通常所需的时间长度。 In a new paper published in the Journal of Social and Personal Relationships, Professor Jeffrey Hall found that it takes roughly 50 hours of time together to move from mere acquaintance to casual friend, 90 hours to go from that stage to simple "friend" status, and more than 200 hours to become "good friends". 在《社会与人际关系杂志》最新发表的论文中，杰弗理·霍尔教授发现，两位点头之交成为一般朋友需要相处约50个小时，变成真正意义上的朋友需要90小时，成为好友则需要超过200小时。 | 
