I've played through the game dozens of times, so I don't remember how long it took me on my first playthrough but definitely longer than 9 hours.
I don't see why it seems so impossible to you to beat the game longer than 9 hours. People play differently, even in a linear game like hl2. If you look at some "let's plays" on youtube, you'll realise that the playtime on a game like hl2 can vary a lot.
I remember when Portal 2 was released, some people finished the game in under 9 hours. There were others who played for 20 hours and Portal 2 is just as linear as hl2.
Unlike a movie, the playtime for a video game changes a lot. Mostly when people talk about the length of a game, they take the average and if I remember correctly, the average for hl2 is between 8 and 9 hours.
I don't see why it seems so impossible to you to beat the game longer than 9 hours. People play differently, even in a linear game like hl2. If you look at some "let's plays" on youtube, you'll realise that the playtime on a game like hl2 can vary a lot.
I remember when Portal 2 was released, some people finished the game in under 9 hours. There were others who played for 20 hours and Portal 2 is just as linear as hl2.
Unlike a movie, the playtime for a video game changes a lot. Mostly when people talk about the length of a game, they take the average and if I remember correctly, the average for hl2 is between 8 and 9 hours.