During normal school sessions, minors ages 14 and 15 may work a maximum of three hours per day, up to 18 hours per week. Work certificates are not required for 16 and 17yearolds.In South Carolina, the law sets a clear boundary: generally, no employment is authorized for minors under the age of 14. 14-15 year olds may work up to 8 hours per day, 40 hours per week, unless attending summer school. From June 1 - Labor Day may work between 7am and 9pm. Minors aged 14 and 15 can work up to 3 hours per day and a maximum of 18 hours per week. Work hours must fall between 7 a.m. During the school year, federal law states that minors under 16 cannot work after 7 pm or before 7 am. However, employers must still establish regular paydays and inform employees of any changes in advance. The most common types of payrolls in the U.S. are:.