Keep in mind-- using a blackout box defeats the purpose of outdoor growing.. longer veg times for higher yields...
in Australia, they will start budding mid-summer and finish mid fall... just like everywhere else.... just not the same months!
If you DO try to "Force" them with a blackout box- remember-- once you start, you have to do it until they finish without missing a single night AND without any light leaks into the box AND
ALWAYS be on time! If you are "off" they will be ligjht-stressed and you will get hermied plants.