Since 1967, we’ve added 167 hours — the equivalent of a month’s full-time labor — to the total amount of time we spend at work each year, and in households where both parents work, the figure is more like 400 hours. Americans today spend more time working than people in any other industrialized nation — an extra two weeks or more a year. Not surprisingly, in those countries where people still take cooking seriously, they also have more time to devote to it.