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how long should I veg?

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Hey guys,I have 3 skunk #1 and 1 special kush,they are 6 wks old under a 400 watt light in a soil/perlite mix. They are showing little white whispy hairs,not a lot but there visible. Is this anaw indication that there ready to be swithced into 12/12? They are regular female seeds . Thanks for any pointers in advance
Cheers
Dusty