Thank you for the interesting post.
My experience of a 4-year long distance relationship across countries is that the level of conversation gets deeper. Chatting over Skype could not have sustained over all these years had we only engaged in small talk. We learned to discuss topics in greater detail, made an effort to share information about our work, giving each other advise and showing sincere interest in the other person's life. Our chats usually lasted between 30 minutes to 1 hour daily. It was quite satisfying and we often prided ourselves on never having any arguments, unlike many couples who live together.