以下、HPの該当部分のコピペです。
(When you applied)You were in Australia, and held a first Working Holiday visa---(If granted a second Working Holiday visa)You can remain in Australia for 24 months from the date you first entered Australia on your first Working Holiday visa
一つ混乱したのが・・・申請フォームで健康診断&X-LAY必要と
自動メッセージ?のようなものが出ましたが
移民局のページには↓
If you lodge your second Working Holiday visa application online, you will receive health advice from the eVisa system. Please disregard this message about the requirements for health examinations as these have recently changed. The department will advise you within 48 hours of lodging your application if any health examinations are required. If you do not require any health examinations your visa will be granted and you will receive the visa grant notification in your email.
このように書かれてたので、健康診断の予約を入れる前に
とりあえず48時間待ってみたら許可のメールが届きました