Some things that help for me (whether in private practice or employed):
-Do 90 minute intakes and 30-minute follow ups
-Build in admin time, even if it is a lunch hour. Try to use time efficiently so that you can typically go for a walk, scroll SDN, or do whatever you want in that downtime.
-Manage your panel so that you have schedule openings for urgent cases. Having several acute patients with no way to manage them except working them in before or after-hours is stressful (and so is ignoring the issue and dealing with a bad outcome).
-If you have a niche interest consider building a practice geared toward that (for example, psychosis, trauma, substance abuse). If in private practice, consider developing a therapy panel (interesting work that decreases the overall panel size significantly).
-Maintain good boundaries. Avoid doing lots of out-of-session work or after hours work. For example, try to fill out paperwork with the patient in session where they can provide additional info and clarification.
I also recommend varying things up. If you have some time dedicated to another activity like research, leadership, or clinical care in another setting that can break up the "grind."
If I worked only outpatient clinical, I would do 0.8 FTE and work four eight-hour days if finances allowed. I think five days of a close to fully-booked schedule would likely burn me out. With a slower, gentler pace I find outpatient work to be pretty rewarding and probably the best practice setting in psychiatry.