I regenerate a lot of my nicest plants and have never had a hermi (tempting fate now arn,t i).
I will second everything Sawleaf has said .
What would be best for you to do is take a cutting of each plant .
Mark each cutting to it,s mother or as it may be father. e.g a ,b ,c and so on.
Place all the cuttings on a 12/12 cycle and within about ten days you will be able to see which of your plants are male and female acording to your labeling.
This way you are able to let your plants carry on growing uninterupted from their 24 hour cycle.