Disclaimer... I have never grown a plant indoors start to finish.

Anytime I see indoor growing, I say nothing, because I know nothing. There are many far more experienced growers here.

The only reason I answered was I saw the question sit for awhile. And I am familiar with those strains. All grown outdoors.

My answer to your question was based on daylight times here, and how each day in late September we get about 2 minutes less light each day. Give or take.

All that said, if your timer gives you 15 minute intervals, start with 12/12 and take 15 minutes off every week....better yet every 8 days.

Will it work?...honestly...the hell if I know.

If I had to bet, I think it would.