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>Marine's 1st Portal 2 session lasts ~4:15 + 2nd took ~3:10 = 7 hours, 25ish minutes
>How Long to Beat says 8 hours 52 minutes is the average
For all people were bitching her time was actually pretty good.
I haven't played the game before, and waited until after to watch the stream to watch her playthrough because it gave me the motivation to finally try it out. Clocked in at 4 hours 54 minutes according to steam