Sometimes the only thing in common you have is where you work and this isn't enough to keep the realtionship going after they have left. With real friends you'l

Sometimes the only thing in common you have is where you work and this isn't enough to keep the realtionship going after they have left. With real friends you'll have some other common experiences that help maintain the bond. So, yes, the amount of quality time spent together out of a forced situation, such as sharing office space, is a big factor.