By Kelly Hockenberry, Columnist, The Times Mothering is very, very hard work. For those of you with older kids, do you remember when they were little wondering “will I ever get 15 minutes to myself again”? Escaping to go to the bathroom uninterrupted was wishful thinking. I recall (vividly) setting the timer on the stove for a mandatory “rest” when my boys refused to take naps (much too early,...