Amazon manages transit times for new shipping templates via Shipping Setting Automation. Automated transit times factor in carrier delivery times promises and actual performance, and are updated from time to time to ensure they remain accurate.
Sellers shipping from Australia will need to review their ship-from address and their carrier preferences. If your carrier is not currently supported, then you can revert to manual shipping templates and define transit times that match your carrier’s delivery speed.
For more information on how to set accurate transit times, see, Step by Step Guide.
If you ship from outside of Australia, click here to view details about international transit times.