I pop after a few days no later than a week after hatching.
Males pop once.
Females.. Pop POp POP.. all day long. Joking. But I do check a few more times.

I had a so called female for almost 2 years then popped sperm plugs and probed and popped as a male. I was still new to popping back then.
*Thanks Heather! for showing me I raised a transexual for almost 2 years... hehe*

That reminds me I am gonna check my so called '08 females again.