Think of all the time you spend planning how you spend your money -- balancing your checkbook, preparing taxes, reading financial advice. Spend at least that much time and energy planning how you will spend your hours. People know that if they don't pay tons of attention to how they spend their money then they'll never be rich. But think about this: If you don't pay tons of attention to how you spend your time, you'll never be happy.
Hat tip: Occupational Adventure