If the employee is under the age of 18 and works less than 30 hours in a week, they are not eligible for superannuation. Microkeeper calculates hours based on the pay cycle itself. For example, if the pay period is fortnightly, it would consider 60 hours (30 hours per week in the fortnight).
An under 18 year old who is set to Full Time status will automatically accrue super regardless of hours work.