8: 30 am-11:30 am, and15: 00 am-17: 30 pm. According to the information of official website of Surabaya United School, primary school classes are from 8: 30 am to 1 1: 30 from Monday to Friday, and from 15: 00 to 17: 30 in the afternoon, with holidays on Saturday and Sunday. A primary school is a school where people receive primary formal education. It is an important part of basic education and belongs to nine-year compulsory education.