Except as provided in subsection (b) of this section, a minor under the age of 16 years may not be employed or allowed to be employed: before 7:00 a.m.; from the day after Labor Day through the day before Memorial Day, after 8:00 p.m.; from Memorial Day through Labor Day, after 9:00 p.m.; or more than: 4 hours on a day when school is in session; 8 hours on a day when school is not in session; 23 hours in a week when school is in session for 5 days; or 40 hours in a week when school is not in session. The hours of work allowed under paragraph (1)(iv) of this subsection do not include any hours that a minor works in a bona fide work-study or student-learner program while school normally is in session. The Commissioner may grant to a minor an exception to the restrictions under this section if the Commissioner: receives the written consent of a parent of the minor or a person standing in the place of the parent; and determines that: there will be no hazard to the health or welfare of the minor; and granting the exception will not impede the minor in fulfilling school graduation requirements.