This is the one thing that totally bugs me that people overlook:
From the moment you're on the train arriving at city 17, through to the sobbing fade-out crying of Episode 2, it is all one entirely linear sequence of events.
I played HL2+Ep1+Ep2 straight last xmas. The setting starts in daylight and cycless through at least three nights. No unconcious knock-outs, no fade-outs. Jusat four days of Gordon Freeman machinist illusory events..
When Gaben was speaking on a podcast early this year, the team on "Richochet 2" he said - something to the degree - that the team on it are piecing together the entire narrative fiction of the universe at the then present.