there is no "minimum" for ftbb hun - it's based on your exact income for the financial year (or your estimate)

if you're returning for over 10 hours per week, and it's the FIRST time you have returned to work since the birth of your youngest kidlet, you can ask them to quarantine your income - essentially it means that your income will only impact the time you're working, not the full financial year.

other than that, if you're returning to work and have already used this, or had income for the start of the year, it will impact you for the whole year and you may have been overpaid that $56 a fortnight anyway... sorry