Da Vinci most certainly worked 80 hour weeks, and I am sure he loved every minute of it. Why? Because he got paid to think up cool shit day in and day out. I have worked jobs that were so mind numbingly boring that I could barely muster 30 hours a week when I was single. Now I am married and could easily pull 60-70 hours a week at my significantly more interesting job. Work is the place you will spend most of your life. Do your best to find a place you can live with.