Brothers Brothers Investigations works around the clock to serve its clients. BBI investigators work between 8-20 hours per day for its client. BBI investigators can always be available to answer any questions that may arise. The BBI office is open Monday through Friday from 8:00 AM to 5:00 PM. On Saturday the office is open from 9:00 AM to 12:00 PM. Feel free to contact BBI to get information on its hours served through the All Questions Form or call anytime.