Flowering sative going on 8 weeks

You can not tell if its done by the white hairs. U need to look at the trichomes and see if there milky white or clear. I never wait to see 25 percent amber or any of that bull shit. If ur lights too strong or too close it will continue to put out white hairs and then it will want to foxtail out. I always give my girls 63 days no matter what from the flip to flower. I harvest with all milky trichomes a few clear a few amber and i get good results good luck and remeber do not trim any leaves off ur bud until its dried for at least 10 days then put in plastic container like an art supply box or just something with a lid with a hygrometer and u want it to be 62% rh stable in the plastic container before u jar it up. So if the meter says 68% rh u open the lid for a day then close the next day until the meter says 60% to 62% rh. Then it is ready to trim. If u wet trim or trim to early u end up with chlorphyl tasting budz good luck

they look like a long way off yet. if it is a true sativa it can be up to 24 weeks flowering. not many indoor growers will grow pure sativa. but even hybrids with sativa leanings can take 10 to 12 weeks. like the others said here, dont rely on the orange hairs, they can be an indicator to start closely looking at the trichomes. the more cloudy trics compared to amber the more 'speedy the effect, the more amber the more chill will be in the effects. once you harvest, it doesn't end there. you need to make sure you have a good drying, and curing process to ensure your growing efforts reach full potential. enjoy your grow

Looks like you still have time to me.. Couple weeks even...

Keep feeding you are still a long way off, see all those white hairs? They will turn into beautiful fat buds, if you feed then well and give them their time, don't flush until you see 75%+ brown hairs 🌱👍

Hi! Orange "hairs" doesn't means anything except dry air. But white pistils means young one, so if you have all your "hairs" orange, your plant just did stop making new flowers. You must watch for trichromes turning from *milky* to golden, this is the only way to know if your buds are ready to harvest. If the pistils are all orange, and trichromes still clear & milky, I usually add a bit more Phosphorus (Guano Powder). Anyway, I don't think your plant is ready yet, your buds haven't fatten, but it's may be caused by another parameter (like your "purple" light may not be strong enough (in my opinion, Blue & Red "purple" lights aren't good at all)).

Does feeding them every week or 3 days sound more right

Tem que estar com 90% dos pelos laranjas para estar pronta voce pode usar lupa que ajudara ver melhor os tricomas, pode seguir fertilizando mais não passe do limites