It really depends in why they have hermied.
I had hermies too, if my lights were to strong/ to close.. or if it was hot
or the combination of both
Most times theyshow up from around week 2 of Flower ( the male parts),
later on appear the female flower.
So be sure to check them if you use hermied plants seeds, its quite possible they do it again
and giving them a lovely envoirement helps a lot to stay female