I still occasionally text or call my previous T who I saw for about 2 years. We ended therapy 3 years ago when she moved out of state. Sort of like you though, I did make myself wait before I contacted her. I waited until the need to contact her didn’t feel so strong anymore, which for me was like 3-6 months I believe? The reason I did this was so that I wouldn’t call her wanting “therapy” and be disappointed since that’s not an option now. This situation works well for me; we get in touch usually every 6 months or so, sometimes longer.