Hi Vas,
As I understand(and may be wrong) a semi auto has properties of both, photoperiod and af.
They should keep vegging under 24h but start flowering under 20/4 or less. I read that somewhere I don't remember.
Outdoors it results in longer veg compared to autos and the flowering is triggered faster compared to photoperiods, which is very good in more northern parts(50+) where at the end of summer sun hours decrease faster.
I can not say this is fully true, because I never tested this properties, I'm actually lower than 50N, so the plant response is different as in Denmark, for example. Also big difference is the climate here, much more heat and less water.
Had a chance to test the AF smoke a bit more and I correct myself, it's already strong
It could easily be picked now, but I think there is still a lot terpenes to develop, this can come out very tasty sweet hashy weed. It has a sweet, tyre/tar, green, berry, pine, hash smell, quite pungent but not expanding, the smoke is still just a bit harsh because the plant is still on feed. Otherwise lovely berry pine hash taste and a long lasting fruity aftertaste.
The effect is heady thick, pretty long lasting 2-3 hours.
I think with this development they will be harvested in two weeks, the third af plant two weeks later.