I give my T a 2 page typed letter once every 2 or three months, sometimes more often. I will usually hand it to him at the beginning of session but I have emailed them the night before if it involves things that he has done to upset me. That way he can read it before session and have a head's up on how to respond. My T always thanks me for these letters because it gives him information about what is going on in my head. I don't know if I would send a 4 page letter. He would probably not get through discussing one that long in one session. 2 pages for my T usually take almost the entire session and sometimes more to deal with. Maybe write out everything you want to say and cut the initial letter down a bit. Then write up the rest for the next session. That way he can give you more thorough responses to your thoughts. Unless you really don't want a response, then I wouldn't see a problem with a 5 page letter. I know my T always wants to address most of my issues whether I care to talk about it or not.