Depending on strain I'd let them bud for atleast 60 days.Check the trich when your close and see if they've turned cloudy or amber.I harvest mine at about 25% amber cuz I like the up buz and hate couch lock.The more amber the more couch lock.
I'd be looking for a good hps light for flowering too.If ya was flower under say a 1000 watter with the size of yer veg I'd say close to 4 oz's or better per girl.Without,,,,, hard to say.1 oz maybe per plant?? I'm getting around 4 to 6 per in soil with a 4 week veg, 50 days in bloom.Strain dependent of course.I'm runnin white widows and a strain called chemo cindy.The c/c's flower in about 45 to 50 days at 25% trich.