I can't believe you have "between appointments." I remember when I was in college and was "between girlfriends." This did not mean I was having a threesome, because that would have been cool. "Between girlfriends," always with air quotes, suggests that there was one before and there would be another one again, and both of those seemed like iffy propositions for a while. And this stage lasted for ... well, longer than you're going to be between appointments by several orders of magnitude.
I'll see you in 6 days, 20 hours, 5 minutes.