Yeah..if you got white hairs poppin up your on your way to Flowering, Lol...these things always take time..One safe way you can make decisions about your plant is by watching their changes every 2-3 weeks....It kinda gives you a ballpark guess on where your at :P
But if you see white hairs... wait like a week or 2 and BAMMMMmm..the damn things seem to double in size by then..it's awesome in every way you can possibly imagine it.