ok lets call it 84 days. Show me a photo worth a damn that's done in less than 90 days, not many!. I've grown at least 30 strains. most finished in 70-80 days. A few in 65-70 days, and a couple ( Dragon's Blood for example ) in 55-60 days!
If your looking for short flower times I would stay away from the royal queens northern lights cuz its at least 2 weeks over. It pre flowers at about week 3 but stays there and just vegges for the next 10 days with very little bud formation before going in to flower. This is how some of the newer autos get there size. They stay in pre flower longer or just delay flowering altogether dell around day 30. At that point you might as well grow a photo plant in my eyes.