So I finally got the chance to play Portal 1 today, (Yes, I know it took me forever) an spent the afternoon playing it. When I finished, Steam told me that it took me a little over 4 hours to beat it. Is this an average play-time, or am I just really thick? I only ask because I see people who say it took them under 2 hours the first time, granted a lot of my delay was dealing with my computer's terrible frame rate and just looking around, but that definitely doesn't constitute hours extra.