It's not about the hours of light.
Sunlight gets interrupted all the time so we are not concerned with the hours of daylight.

What will bite you is the hours of no light.
Once plants sense >12 hours of darkness, Florigen is produced.
That will trigger flowering.

You should be able to get away with 24:0 for a while with regular girls.
And you should be able to drop back to 16:8 without much fuss.

However, I know squat about autoflower plants, never grew one.

Hang around, someone who does know may pop in.

Aloha,
Weezard