Minimum light hours needed for flowering stage

[endgegner]

Hello,
I have a 30 x 30 x 60 cm grow tent for breeding.
I wanna cross an Ethiopian male with two other females and the Amnesia Core Cut.
Right now I start with a 10 / 14 (lightness / darkness) schedule. But how far can I drop it, for obvious reasons I wanna reduce the stretch as much as I can.

Mid november in Germany has 9 hours lightness, so I assume dropping it to 9 is not a problem, as a few people managed to get a long flowering Haze in Germany outdoor in a golden fall (it is not usual though, but also another topic).

 

[goingrey]

I suspect it will be a minimum DLI not a set amount of hours

 

[endgegner]

I suspect it will be a minimum DLI not a set amount of hours

Makes sense. I have read something about DLI, but didn't find anything specific for my use case.
I guess I will just go from 10 to 8 hours and increase the lightning with my E27 LEDs.
Currently, I only have one 10W LED with 6500k. As this makes bushier growth. They cuttings are freshly rooted.

 

[endgegner]

For those folks like me, that never heard of DLI and don't wanna google it - the nutshell version:
It means: daily light integral and is a mix of mainly lightning duration and light intensity (PPFD).
But other factors also matter, like the stage of the plant.

Here is the formula:
DLI = PPFD x light hours per day x (3,600/1,000,000)