Main Clinic: Family Practice/After Hours Clinic. 110 Millsaps Drive. Hattiesburg, MS 39402. Regular Hours: Mon - Fri: 7am-4pm. After Hours: Weekdays: 4-7 pm (walk-in's accepted all day) Sat: 8am-2pm . Sun: 12pm-4pm. Appointments and walk-ins are seen during regular business hours. Walk-ins only are seen during the extended After Hours. West Clinic:.