First Day at my New Job

In case you're just hearing of this now - after almost 9 years with thedatabank, I took a new position at MAP for Nonprofits, starting today. Instinct, and what details I could observe so far, tell me I'm going to generally like the job and my coworkers. It's funny how quickly a person can appear settled in, without beginning to grasp what the job IS. I sat in my new office, sending messages from my new email address, using items in my new desk, and I felt like an imposter. Understudy for the role of Director, Technology and Innovation. Substitute teacher. I've been part of a rapidly changing field, and a growing company. Yet for many years now I have felt comfortable with my role, the boundaries of my authority, my professional identity; I knew my coworkers, could anticipate how they would react to things, and knew who to ask when I needed help. Starting today, I'll be ad-libbing for a while, and it feels awkward and thrilling at the same time. How long does it take for a new job to feel real?