Might seem like an obvious qu. but would be interested to see if anyone's come across an enlightened employer who has provided flexibility in hours to enable this to happen.
Or is this still pie-in-the sky stuff?
Most of the senior women role models in my place extol the virtues of round the clock nannies or SAHD's in order to get up the ladder. Not much evidence as far as I can see of any other way at least where I work.