Yeah, a lot of factors come into play and vary greatly. Important to remember, the beginning session(s) are simply introductory sessions for the therapist to get to know you and determine whether you do or do not have GID. If diagnosed, that's when you bring up your transition plan (if you have one) and the fact that you'd be interested, at the therapist's discretion, in beginning HRT as soon as possible. On that subject, make sure you've done your homework on HRT, as for me at least, my therapist wanted to be reassured I knew of the side effects and what the hormones would actually be doing to me both mentally and physically. Overall, all I can say is if you want best chances of getting the letter of recommendation for HRT as soon as possible - be yourself, hold nothing back, ask questions if you have them and stay confident.