Light timing problem

I did my growing 40 days and i turned yesterday plants to 12/12 cycle but when changing timer i discovered it was set wrong and plants was getting only 15h 25m every day.
It's a problem for flowering ? Plants will flower now? Need give 18H for some time or i am fine ?

Plants are really nice and healty from 40 to 60cm, 3 X Hawaiian Snow(Greenhouse) , 3 X WhiteWidow(Greenhouse), 3 X Skywalker(DutchPassion).

It shouldn't be too bad at all. The recommended is 18 to 24 but you know that. If they look healthy, that just means they have adapted well. You shouldn't have a problem with flowering at all.

I agree with jon on this one, shouldn't be a problem.

Ok thanks :)

you didnt notice this for 40 day?

Plants are in a empty house of a friend, he never checked if lights was shutting down at 3am :P