The minimum hours per day was initially set with 38h on the website as the standard working hours in almost all the industries eligible for the working holiday visa are around 8 hours per day. We talked a lot with an immigration agent working for home affairs who told us that they have a "flexible approach" about the number of hours per week. Then we changed with his advice the minimum hours to 30 hours per week. The Australian government has many difficulties to find workers in the agricultural sector especially in remote areas that's why we think they have a flexible approach about the working hours. However this information is not clearly written on the home affairs website and it's always better to get at least few more days. They only gave an example where Maria works on a dairy farm milking and other duties:
Maria works on a dairy farm milking and other duties. Maria makes an agreement with her employer to work five days a week (Wednesday to Sunday) from 4am to 7am and 1pm to 4pm each working day (a total of six working hours per day) for three months. These hours are considered normal for this role and Maria is paid the correct legal wage. Maria can count every day of work towards the three month specified work requirement, which she meets. homeaffairs.gov.au
How to change the default value to adapt the calculator ?
According to these information, the algorithm is based on 6h of work per day but you can change it quickly:
1. Add or Edit a new payslip
2. Change the field "working hours per day" to adapt the result
3. Save
4. See the result in the list of your payslips