Indoor alot of pure sativas do that. Ive seen some seed plants take over 9 weeks on 10 on and 14 off to even throw a pistol. Outdoor were they come from its different as they use subtle changes in the sun, angle, the light spectrum, temperature and age ect to trigger into flowering at the right seasonal time. As some of these places the light and dark hours dont change much with the seasons. Indoors you have to let the plant mature till it reaches age and then it will bloom a little faster. Indoors with sativas you can veg them under 13 on and 11 off, some even 12-12. Once they get to about 3 months old and its usually faster with a clone and less space consuming to go into 10-14 then. Anyway you have fun man, I like sativas so will enjoy watching your grow of these.