" 40-hour weeks are made of 8-hour days. And 8 hours is actually a long time. It takes about 8 hours to fly direct from Chicago to London. Ever been on a transatlantic flight like that? It’s a long flight! You think it’s almost over, but you check the time and there’s still 3 hours left. Every day your workday is like flying from Chicago to London. But why does the flight feel longer than your time in the office? It’s because the flight is uninterrupted, continuous time. It feels long because it is long! "
― Jason Fried , It Doesn't Have to Be Crazy at Work