A lot depends on maturity level when you put 'em into flower. If you put them in there before they start showing preflowers, then you wait, and start counting from the point they start showing the calyxs and pistols.

If they are showing preflowers prior to switching, then technically the clock has started clicking, but is on 'pause' till ambient conditions warrant flowering.

Either way, the plant's metabolism takes a week or two to switch from vegetative growth, to the flowering cycle...depending on growroom specifics and strain. I add this adjustment period to the flowering time.

I pretty much stopped getting caught-up in worrying about actual flower times, as there are many factors that can delay the time to maturity, yet virtually none to speed-up the process. Stuff like heat, cold, ph fluctuatuions, over/undernute, old bulbs, crappy soil...are stresses that will affect the ladies.

Breeders' strain info is a guideline, not cold-hard fact. Unless you are using their grow techniques, their nutes, their bulbs, their pots, and their growroom controls, your results may vary. :thumbsup: