1 month in veg on 24 hours light, how long to see sex?

Just curious if i start from seed and i keep my lights on 24 hours a day while they veg how long would it take to see if they are male or females? Do i have to swtich to 12/12 to find out or will they eventually show while in veg?
 
they will eventually show in veg but if u flipped to 12/12 today expect 1-3 weeks till you see sex with 2 weeks being the average
 
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