My first go around (not counting the tutorial game) I waited maybe a day. Like so many the first time around, I did not have a villager trained in the way to solve #12. So after waiting a day, and hearing how long some waited for this little dude, I decided to just start over.
The third time around, it happened like clockwork. I finished the hut; bolder, completed #12 then just started breeding like crazy. I think my pop was around 38 when I started going for the GC, so I just took every female and told her to let her hair down and make some babies. After about 9 or 10 bleedings, boom there he was. And it took not time (30 mins or so) for her to do her magic.
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The VI