An employee in Work Week Group 1 or Work Week Subgroup 4A who has completed a normal work shift, or an employee in Work Week Subgroup 4B or 4D on an authorized day off, when ordered back to work, shall be credited with a minimum of four hours' work time provided the call back to work is without having been notified prior to completion of the work shift, or the notification is prior to completion of the work shift and the work begins more than three hours after the completion of the work shift.

When such an employee is called back under these conditions within four hours of the beginning of a previous call or an additional call is received while still working on an earlier call back, the employee shall not receive an additional four hours' credit for the new call back.

When such an employee is called back within four hours of the beginning of the employee's next shift, call back credit shall be received only for the hours remaining before the beginning of the employee's next shift.

When staff meetings, training sessions, or work assignments are regularly scheduled on an employee's authorized day off, the employee shall receive call back compensation; when staff meetings and training sessions are regularly scheduled on an employee's normal work day and outside the employee's normal work shift, overtime compensation shall be received in accordance with the regulations governing overtime.