My T works M-Th, and when I had regular, weekly sessions, I used to like any day but Monday. Something about having a Monday appointment, and then having the whole week to get through until the next appointment was hard for me. It seemed like the week was longer that way. So my ideal was Tu, W, or Th at the end of the work day. That way I didn't have to go back to work. But since we went off the regular schedule, I am pretty much OK with any day or time we both have free so at least I can see him! He can get pretty busy and me too, so finding a free time that we overlap can be a challenge.