Smallest container to determine sex in.

Would I be able to do 12/12 from seed in a red plastic cup (solo, dixie cup), and be able to determine the sex in that small of a container? I have limited growing space in a box. Also, If its possible to know, how long would it take? (any rough guess)

Someone drop some knowledge on me.

Is it possible? Stupid?

yes it is possible, prob best to have roots going first. i would think you would know by 2weeks but dont quote me on that.

Yes. 12 12 from seed will show sex in 3 weeks. Count flowering time when pistils show. I noticed this thread that I started was useless so I figured I should give the answer in case someone would stumble upon it.