G. Mark’s Answer
I can only speak for my own counseling experience for students. However, I also talked to some psychologists and psychiatrists about this. In general, most days spent counseling involve having people come into the office. Obviously there are outside activities, professional gatherings, meetings, outside research, etc.. But the general case is spending a lot of time talking to people. The outside preparation comes from analyzing your notes and sometimes looking to others for input and analysis. The nice thing about this is that you are constantly learning. Instead of dreading doing all the outside work, I found myself looking forward to each new question as an adventure and an excuse to learn more.