Question
Now that I finished the game I wanted to start training for a speed run but I'm not sure how I can time it.
Is there a built-in function I have to activate?
Is it just timed "manually"? If yes do the cutscenes count or not? And how can you time it so precisely, for example this guy (for portal 1 though) has it down to the millisecond.
Answer
"Down to the millisecond" may be a touch disingenuous; the time 0.567 is about 17/30, or 17 frames assuming the video is 30 fps, the default rate to export frames from a Source engine demo (see here). The final time he calculated (in seconds) would then be the number of frames he got from the startmovie command divided by 30.
As far as how speed runs are "officially" timed, the most "official" (notice the quotes) body I know for speed-runs would be the Speed Demos Archive, who maintain a decent amount of runs across various platforms. They have an FAQ about how to time runs, which may also play a role in how he figured his time (their rules say from the start of player control to the end).
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