Somewhat variable when compared to the UK since we have such a vast country and standard approximations just don't cut it
Looking comparatively and differences between first light and sunrise and then between sunset and last light at different locations in Australia and UK:
We find the variation is between 22 and 27 mins FL to SR and the same SS to LL in Australia - perhaps an average of 25 mins?
In UK it is presently 36 to 37 mins FL to SR and 30 to 38 SS to LL - perhaps an average of 35 mins.
In Australia you have to use a calculator or app to establish LL times for VFR flight when the national average is about 25 mins.
In UK we just use 30 mins after sunset as the cutoff.
Who is making mountains out of molehills?
Tuilagi vs Kerevi in the midfield will be interesting