need help for vegetation time sativa

hi, i have three big sative female in a grow tent and they are in vegetation since 60 days and they are 5 feet tall and someone told me that its was after 8 to 10 week but im not sure its my first grow and they look really tall so should i put them in 12/12 or should i wait a little longer????????????????????????

If they were mine I'd go to 12/12 now. They may get even bigger once they start to flower. Of course, if you have room in your tent and are so inclined, you could veg longer. But I'd flip 'em.