This from the CI website:
"There are three different ways of calculating your annual leave entitlement:
Based on the employee's working hours during what is called the leave year, which runs from April to March. An employee who has worked at least 1,365 hours in the leave year (that is, an average working week of 26.25 hours) is entitled to the maximum of four weeks' annual leave. Many employers use the calendar year (January-December) instead of the official leave year to calculate entitlement
By allowing 1/3 of a working week for each calendar month in which the employee has worked at least 117 hours
8% of the hours worked in the leave year, subject to a maximum of 4 weeks
An employee may use whichever of these methods gives the greater entitlement."
An employee who has worked for at least 8 months is entitled to an unbroken period of 2 weeks' annual leave.