I’m guessing 9-10, although I’ve found outdoor transitions more gradually so it’s always hard to know when to start counting. Usually by mid-August there’s clusters of flowers forming, and stretch starts around the beginning of August. So ten weeks from when the stretch starts gets you to mid-October.
It seems like this one has triggered early. This is the kind of growth I usually start seeing after I flip the lights indoors.
I did an Irene x LP last year that was done around the 20th of October. But I had struggles with Septoria that I’m not having this year.
This is in Toronto so 44N.
My Zkittlez x Purps was ready first week of October.
A warm September with lots of sun really speeds up the flowering as well.