Since yesterday (day 69) we are on 12/12. Like i said, over the last week i gave them 1 hour of light less per day.
Also, i defoliated them on day 66 and they are already on their way to get as bushy as before + they are growing pretty fast in height, so i guess the first growth spurt of flowering already started.
I will let them grow until the distance between them and the light is 30cm, at that point i will try to keep the distance.