how long?

i started from seed , and im about a month in . most everything is about 6 inches tall and has 4 nodes. how long before i will be able to determine what the sex is .
any certain way i go about it ?

and one more question . What does LSTed mean . sorry for the noob question.

lst means low stress training, basically tying it down. It will show sex in veg when it is mature enough to flower. It depends on the strain how low this will take. I am doing master kush right now and it has pre flowers at 3 weeks. When you cut the light back to 12/12 it can take up to 10 days to show sex.