the time of year would play a big part in that i think as it isn't until mid summer that the days are 12/12 and getting shorter which would encouraging flowering more than 13/11 unless you used lowryders like BL's masterkush which flips under 24h
No.
The only way mid-summer hits 12-12 is if you happen to live exactly at the equator. If you do, by all means do NOT look for an early-finishing strain, but instead grow one of the excellent super-long flowering equatorial sativas that are hard to grow outdoors anywhere else!
Everywhere else on the planet, outdoors, 12-12 light/dark occurs at the autumnal equinox, Sept 21st (and vernal equinox, March 21st). With normal outdoor growing in most of the continental USA, by the time the light naturally gets to 12-12 outdoors, not only have most photoperiod plants been flowering for roughly two months already, but many strains are fully mature and ready to harvest. The truly "early" strains will have ALREADY been harvested BEFORE the days get to 12-12!
In fact, most cannabis plants grown outdoors in the continental USA will actually start to flower around the end of July, when there are about 14 hours of daylight.
There are VERY few strains that actually "need" 12 hours of uninterupted darkness to flower; most will start to flower with only 10 hours of darkness, and a few super early strains can start to flower with as little as 9 or even 8 hours (eg the "Iranian Autoflower" or Guerilla Gold 3). The ruderalis-based autflowering strains aren't photosensitive, so they can flower outdoors during ANY time of year, so long as the plants themselves are at least a few weeks old and sexually mature.
Other than their genetics, the single biggest factor affecting the calendar date when plants put outside will finish is actually the LATITUDE, because its the latitude that controls how many hours per day of sunlight you see.
The closer you get to the equator, the closer EVERY day (all year long) is to 12-12. The closer to get to either pole, the LONGER the summer days, and the shorter the winter days.
If you go up to Alaska, for example, you don't get "down" to 14 daylight-hour days until September. Unfortunately, the days get shorter so fast up North, that by the end of October just 8 weeks later, you're already down to only 8 daylight-hour days.
Anyway, getting back to the original question, pure indica strains (including master kush) tend to be fast finishers, and most of these will be done at or before mid-September outdoors.
Again, autoflower strains will be done roughly 10 weeks after you plant the seeds, making them ideal for outdoor growing. Not only can you have plants ready for harvest in June (if you start them indoors and put them outside in early April), but you can stagger planting new plants all spring, and have continuous harvests all summer through fall, if you like.
