hi freinds , i am moving to Australia .
in 2017 i got my dependant visa for 1 year.
in 2018 ,i got 1.5 year visa extension.(bcoz my Passport was expiring)
in August 2019 , i got 3 years visa extension.
NOW In, 2021 august .i am moving to Australia.
how long i can stay outside Hongkong if i need to extend my last dependant visa?
if i stay morethan 21 months ,can i enter hongkong to apply for extension and go back to Australia?