Keep in mind that often, some of the breeders' flowering times are by professional breeders, under more than ideal conditions, and years of experienced routine. Some are journeymen (or women) still mastering the craft.
Perhaps best to look at them as approximate, and add a couple of weeks till you get the hang of the strain, regardless of the strain you choose. After all, more likely than not they use different lights, different soils or a hydro variation, different nutes...so results may vary. :jointsmile: