Yeah I am also wondering where this 4hr per day statistic is coming from. Dinner for two usually takes no longer than 1 hr a day, dishes usually put in the dishwasher every other day, and we reserve Sundays for cleaning, laundry and taking out recyclables. I cannot fathom anyone taking 4 hrs every single day to do housework, unless you have some kind of aversion to a dirty clothes bin or dishes piling up in the sink or Mr. Clean holding a gun to your head.
Unless you're a neat freak and insist on ironing and starching your socks, one hour a day is plenty.
If you have a large family, then delegation is the answer. Laundry and dishes can (and should) be offloaded to the offsprings.