What is the relationship between the closeness of your relationship and the need for frequent communication?

How long can you go without hearing from [fill in blank] I have friends that I can go for years not hearing from, and it’s all good when we get together, or I get a call. But there are other people that I just don’t feel right, if I don’t get a call almost every day. Most people are somewhere in between.

Think of the important people in your life. How long between contact can you go for each of them? Does the need for frequent communication correlate with the closeness of the relationship? Why or why not?