Sexing a plant

[bobulak]

Hello everyone. I've got a question. What is the maximum time it takes for a plant to show its sex when switched to 12-12? I have a Purps plant grown from a feminized seed that makes me think its a male, but I'm not to sure. The plant is 9 days into flower. Its being grown in soil. Any help would be appreciated

 

[Mats]

It should show pretty soon. The flowers aren't big when they show sex so you have too look carefully.