I know that the length of your flowering period depends largely on indica or sativa. What I want to know is when do you start the count? I also understand that a lot of it comes from practice and experience/or too many damn days reading these forums. But I'm a numbers guy. And many seedbanks offer a specific number of days that have been used for that particular hybrid. Is it at first signs of flower/sex? Or, exactly when you flip the lights?