Breeder information for number of days or weeks needed to flower are basically nothing more than estimates that were based on their results when growing using their setup and growing under their conditions. True flowering times needed are a real 'your mileage may vary' sort of thing.
Check your trichomes closely, and often and watch for the color that will give you the most of what you like and want, and watch for calyx swelling and when the combination will give you what you want most from your plants ... give them the chop and then give them a long slow dry under as proper of environmental conditions as you can create and maintain and then give them a long slow cure and your bud will then be the very best you are capable of making it be.