Part time employees receive pro rata grant of sick leave according to actual hours worked. You are entitled to 5 days paid leave a year without a certificate. However this can't exceed 3 consecutive days. There is discretion in regard to accepting a medical certificate. However, your supervisor should not generally be querying the professional opinion of your doctor about your health.
Sick leave is calculated on a minute and hourly basis.
This is also the case if you are on committed scheduling. Staff being denied sick leave without a certificate - generally you can not be denied payment for taking sick leave without a medical certificate if you have taken less than five days without a certificate in the period since your last sick leave credit was granted. However your supervisor can ask you to produce a medical certificate or a statutory declaration within a day of your return to work, even if you have taken less than five days without a certificate. CPSU does not agree that this should be standard practice. This practice is unlawful and CPSU advises members not to fill in the Key Target Area on unscheduled or unplanned leave.