there are no short cuts other than tweaking the light time, but that is not advisable. at that 3 months there must be preflowers showing and if all you're seeing are nubs then most likely it's a male. males tend to show first and will be a bannana shape or spade...and your one hour on, one off won't do anything but screw em up and possibly hermi them. just follow the rules already written and all will be well...promise.