If you're legally required to do half of the housework, who defines what the whole is?

There's a new Spanish law requiring men to do half of the housework. (Via Memeorandum.) And yes, it's ridiculously intrusive, weirdly unenforceable, and unfairly blind to whether the man works more outside the house, but what really bugs me is that requiring half assumes you know what the whole is.

While Spain's women daily perform at least six hours of housework, men clock up only 44 minutes - plus 51 minutes of childcare to their spouses' daily average of six hours.

What?! Do American couples spend 88 minutes a day on nonchildcare housework? Spanish men are supposed to do half with the whole determined by the bizarre six hours that the women spend? I say the women should just cut back to 44 minutes, leave the men alone, and reach equality by a far, far happier method.