@Tamerlane
A few might be twins or triplets (which is feel like is pretty possible since a few of them look very similar in size and a 9 month difference when ur young would result in some difference in size most of the time), decreasing that time.
I mean, her tastes are pretty clear: she likes a partner who comes with a nice pair of balls (and chains)... come on, I can't be the only one who thought that.
@Hwanito
you missed one, there are 12: two shadows in the bac, and as others have mentioned her belly implies the 13th, so they already have a soccer team