A part-time employee is entitled to leave for his or her average number of work hours in a two-week period. Therefore, you calculate hours of leave based on the number of hours the employee is normally scheduled to work. If the normal hours scheduled are unknown, or if the part-time employee’s schedule varies, you may use a six-month average to calculate the average daily hours. Such a part-time employee may take paid sick leave for this number of hours per day for up to a two-week period and may take expanded family and medical leave for the same number of hours per day up to ten weeks after that.
If this calculation cannot be made because the employee has not been employed for at least six months, use the number of hours that you and your employee agreed that the employee would work upon hiring. And if there is no such agreement, you may calculate the appropriate number of hours of leave based on the average hours per day the employee was scheduled to work over the entire term of his or her employment.
Reference Article