Balance of work/rest

What is the right balance of work vs rest in your opinions? As an example, you go out and work a 9 hours shift, doing your best all day, at a fast pace. You get home and make dinner and insure clean laundry is available for the next day, clean up the kitchen and vacuum the living room. Is it lazy to rest at this point or have you earned it? Obviously i realize if you have kids or another pressing matter you would have to take care of that. But what are examples of laziness and normal rest?