It would take an EXCEPTIONAL woman to pull this off. But, how long she can do it is another question.
I think that 99% of the career women cannot balance career and family life effectively because there are numerous casualties across the board (broken homes, divorce, troubled youth, mental stress, infidelity, unhappy marriages).
I also think that women who think they are pulling it off, may be pulling the wool over their own eyes. The best judges of this juggling routine are her children, husband, and employer. I would tend to think that the "professional" woman gives her very best to her employer first and her family gets what is left over, and it's usually her husband that gets the crumbs that fall to the floor...if he even gets that much.
So, if she needs to "slack" off a bit and redirect her stress or even unload emotionally - it will be done at home and there is just too much evidence to even argue the point.
According to the U.S. Census report released in (2006), mothers only spent 15 more minutes each day with their children during the work-week than their husbands did (on average). Now consider that over 10 million American children come home from school to an empty house every day of the week, and the plot thickens.
Then, throw in all the Prozac and other mind-altering drugs many of these women take in order to cope with it all, and I think the picture is quite clear.
So, how does a professional woman manage the balancing act between family and work? Well, in most cases, not very well.