How long does it usually take from the time your plant shows her pre-flowers to the time of full on bud/flower production, I always thought it was a week but this girl i have growing now has had preflower pistils for a week and doesnt even look to be starting to flower.
Is it indoors or outdoors? My outdoor plants have had pre-flowers for over three weeks and still aren't in full blown flowering yet. Plants show their sex once they reach sexual maturity. Indoors depending on the strain can take anywhere from 1 to 3 weeks after you switch to the 12/12 light cycle.