regular plants will show sex at around 5 weeks of maturity during the veg period 16-24 hours on 4-6 sets of nodes/branches maybe more , you will have to get close to spot the "pre flowers" these are not buds but tiny little individal calyx's with maybe a few pistils visible or maybe a stalked male flower these preflowers will enable you to sex the plant during the veg cycle
in order for the plant to actually flower and produce buds, you will need to switch the cycle to 12 hours the buds on a healthy plant will be visible from 10-14 days after the 12/12 has started
autos will obviously flower and produce buds without changing the cycle at all
good luck

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