Want to know the answer to this question? Try SteamLeft.com. Sign in with your Steam account or enter your Steam profile ID (provided it's public) and the site will estimate how much time you'd take to complete the games in your library and provide you with the results. It says that I need 3689 continuous hours (153 days,17 hours,10 minutes) to complete my whole library in which I could write 7,378 blog posts and watch the entire Star Wars series 277 times! What does it say about your library?