I wrote my T for 6-7 years between sessions and when she was away, actual letters mailed to her office. We didn't discuss very much about them, often didn't even acknowledge they'd been received by her. In 18 years I think I only called her on the phone 3-4 times for out-of-session contact.

I think it all depends on your and your T's relationship. What they are comfortable with, what you're comfortable with and what "works" to help you.

I decided to stop writing my T myself, to keep contact to only the session in about my 7th of 9 years. It was very frightening and difficult but I was able to "contain" myself and not spill over into writing my T. I was very proud and my T was pleased also. Our sessions became more personal and intense because that was the only time we "saw" each other.