The Director of Labor shall grant permits authorizing the employment of persons on days of rest designated pursuant to Section 4 of this Act. Such permits shall not authorize the employment of persons for 7 days a week for more than 8 weeks in any one year, unless the Director finds that the necessity for employment of persons on their designated day of rest cannot be remedied by increasing the number of employees or by adjusting production schedules. The Director of Labor shall give due consideration to business necessity and economic viability in granting such permits.