I usually veg to my vertical limits, not to a calendar. Plants stretch in flower, so a plant's headroom has to be a consideration.

Generally about 2 months veg, 2-3 months flower, depending on phenotype. (sativa or indica dominates)

A breeders insight to flowering tmes are a tad subjective. If you use his nutrients and additives, his 1000w HID lighting array and ventilation, use the same water quality, and have a firm working knowledge of the strain...you'll be in the neighborhood. But don't freak if it takes a tad longer. This is normal. :thumbsup: