to clarify my first post -- i saw reviews of nirvana white widow that said they vegged for ten weeks - then went into flowering for another 8-9 (i haven't grown it yet).
last year with the master kush, the plants started to show sex after five weeks. i immediately switched to 12/12 and harvested in another five weeks (the odor was simply too strong to cover up and the plants had to go). however, i'd say i cut only a week early. about fifty percent of the pistils had changed colors. the total growing time was 9-10 weeks (total growing time). hence, the questions of what the 8-9 weeks (or 73 days - or whatever) "flowering time." the kush last year flowered and matured in half the time indicated as "flowering time." any and all comments are welcome (and the master kush was a blast!)