Shagrath answered grow question 2 years ago I've never grew autoflowers but I've read few studies about plant growth at different light periods and I'm going to test it myself.
Studies show that cannabis in vegetative stage grows sturdier and has bulkier stems in 24hrs of light than any other BUT I've also read that flowering hormone is produced only during the dark periods of light so maybe 18/6 is pretty safe bet all the way or my advice would be to grow in 24hrs of light until you see her start to flower and switch to 18/6 and gradually lower it (15mins/week or 30mins/2weeks) to 12/12. Never tried it but this is what I believe would give great results and I'm going to do this with my first auto when I get it.
Hello from Russia, great job, keep it up!