How long to flower sativa outdoors?

Say i hypothetically had a sativa dominant plant outdoors that is positioned to receive light from sunrise to sunset. this is giving me about 10 hours of light per day, even in november. how long can i flower this chica. she still has tiny buds, and 80% white hairs, however the hairs/calyx on the top cola are going purple from near freezing temps. the moon seems to have stunted flowering as we had 5 clear nights with near full moons in a row. should i go until first hard freeze?

You have little choice if you want any bud. Have yo used any bloom nutes? High in K and Po? Or molasses to help her along?

Entirely depends on strain. Some sativas take forrrrrrrrrrever. 12+ weeks. Others, like vanilla kush, only take 9 weeks. I'm sure there are others that take even less time.

Harley is right, I have a Sativa outside at 12 weeks now to prove it
I still have another month or so, but the cold weather is making her really drag her leafs and grow sloooooooowwwwww.
Just this past week, I started bringing her inside, in the evening before it gets down below 50, and putting her in the closet for the last few hours of light.

I had a Super Silver Haze bud monster. 65" and had to lay her over under the HPS. HUGE buds that never filled out completely, new flowers kept popping and the shit ended up airy and worthless. In the meantime other plants came, went, had no trouble and provided excellent smoke. They were Greenhouse SSH so I am highly suspicious of their offerings anymore. Seeds were given to me so i didn't want to bitch too hard but . . . ..