(1) School districts must observe all classroom teachers for the purposes of a comprehensive evaluation at least twice each school year in the performance of their assigned duties. School districts must observe all employees who are subject to a comprehensive evaluation for a period of no less than sixty minutes during each school year.

(2) School districts must observe new employees at least once for a total observation time of thirty minutes during the first ninety calendar days of the new employee's employment period.

(3) School districts must observe employees in the third year of provisional status at least three times in the performance of the employee. The total observation time for the school year must not be less than ninety minutes for such employees.