A part-time MFT, or marriage and family therapist, is a therapist who focuses on counseling married couples and families, and who works 35 or fewer hours per week on a flexible schedule. As a part-time MFT, your duties include assisting couples and families with issues affecting their mental health or family dynamics. One of your primary responsibilities is to offer treatment through private counseling sessions on a routine basis or as needed for the couple or family. You may work as a part-time MFT for a therapy business, hospital or medical facility, or as part of your own practice.