Several times, my T talked about the necessity for therapists to be able to compartmentalize effectively. They have to keep one client separate from the next, and they have to keep their work separate from their personal life. Those that are unable to do that tend to have boundary issues and also end up burning out. That doesn't mean they never take a phone call or think about a client after hours, but they are able to do so and go back to whatever it was that was going on without it dominating their personal life. That also means once you leave their office and the next client comes in, they have to leave you in that one compartment so they can give that same level of attention to the next client.