Guided Han River tours Free tours making stops at historic sites near and around the Han River will run through November. The tours will start at 10 a.m. and 2 p.m. daily, with each tour lasting about two hours. Reservations need to be made five days in advance for individuals and a month in advance for groups, at visit-hangang.seoul.kr. Text messages will be sent when reservations are made or if a tour is canceled.