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The latest you can enter Australia is 12 months after the working holiday visa was granted.
From the Department of Home Affairs web site:
How long you can stay
This is a temporary visa. You must enter Australia within 12 months of the date we grant it.
The visa becomes active on the date you enter Australia. Once you have entered and the visa is activated, you can:
- stay in Australia for up to 12 months
- leave and re-enter Australia as many times as you like in that 12 months
To see when you must leave, use VEVO.