I can leave a voice mail or send an e-mail to my T after hours/on weekends. I'm pretty sure he has NEVER called me back on a weeknight, even if I needed a call back. He will call back the next day. He has called me back on the weekend the two times I asked for a call - one was because a friend had died unexpectedly, and I can't remember the reason for the other one, but it must have been pretty serious for me to ask for a call on the weekend.

My T is SUPER busy and is often out of town, so he is really hard to reach if it's not office hours. When he's out of town, he has a back up therapist I can call, and he also leaves the number of a local psych hospital on his message for emergencies.