Never grown anything that flowered for over four months :) From limited longer flowering sativa experience, they seem very finicky in flower, light nute tolerance. They get hairy but are very slow to progress from there. Tried gradually reducing light down to under ten hours a day toward the end, but not sure it made much difference. I guess a plant grown near the equator wouldn't see much variation in length of day maybe. Could be kind of high maintenance, but nothing like that landrace flavor :).   Good Luck!