how long after i see pre-flowers do actual flowers start?

i grow outdoors and ive had preflowers for a couple weeks now, i was wondering how long it takes for flowers to start growing??????????????????/
 
thanx, any idea why she already got pre-flowers and showed me she is indeed a female, it can be that long before she starts flowering, i didnt force preflowers she jus did it on her own!!!
 
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