i'd say bout 6-8 weeks. ......when you see the pistels is when it starting to flower and once you start to see some develoment in bud groth................ go to weedfarmer.com and type in when to harvest
Throw the switch and mark the calendar. That is only a ballpark anyway. It is easy when you are growing one strain for a long period of time. You get to know the strain and can better predict the finishing time.
i start the count about 2 weeks after the flip to 12/12. but only keep note of the day count for reference on future grows of the same strain. you gotta watch the trichs not the calendar.