Dr. Craig says, "it's a reflection of the fact that childcare is a family and leisure activity for men."
First, let me state right away that I am certain that Dr. Craig is correct in asserting that there is a great disparity in Australia between men and women in their childcare responsibilities--much like there is in most countries in the world. One of the only countries I have visited where I didn't see such a disparity was Denmark, where I regularly saw mothers and fathers sharing all aspects of child-rearing. Dr. Craig even mentions Denmark in her article.
However, I have a few methodological questions about Dr. Craig's study. How were the data gathered? Did both men and women contribute to the data? Did participants keep daily diaries? Did the number and age of children have no bearing on the results? How was divorce and subsequent custody arrangements taken into consideration?
I tend to dislike reading generalisations about men and women (e.g., "it's a woman's job and a man's hobby"). Social scientists who study gender rarely seem to have problems making such statements, even though stating the same sorts of things in terms of religion or ethnicity, for example, would be completely unacceptable (e.g., "childcare is a family and leisure activity for Blacks"). Such simplifications are usually part of an agenda where the researcher is striving for social change. I am all for the social change, but I worry about the effects of sending a perception that one gender is more at fault than the other.
In my specific case, I easily spend at least 14 hours alone with Will on weekdays, which includes "feeding, bathing, and ferrying him to and from childcare." And I work full-time. V. is able to spend more time with him, but she also works half-time. But, according to Dr. Craig's study (if the data are as solid as one would hope), the typical Australian child only gets a total of 3 hours (mum) and 6 minutes (dad) alone with their parents. The fact that it's just 186 minutes should be getting as much attention as the disparity between the genders.