generally takes about 4 to 5 weeks veg and then another 5 to 10 days at 12/12 to sex em! this plants looks relatively healthy not very tall but i guess is you like bonsai,lol
the height concerns me for over all yeild tho...generally ppl start sexin em about like i said 4 to 5 weeks between heights of anywhere from 8 to 12 inches is possible. after about 5 to ten days under 12/12 lighting you should see definite pistils or "balls" for lack of better wording,lol...get a magnifying glass if ya can, it helps in the early stage of sexin em... ya don't want a lil male to surpise ya! I know folks that use 12/12 all the way thru after that stage , till the end...which can be anywhere from 4to 6 weeks on up to 10 or 12 depending on species and conditions.
good luck!