If non-steam World of Warcraft, most likely over 6000 hours over a period of 6-7 years and multiple accounts/servers. Second place probably goes to league of legends, probably around 2000+ hours over 4 years, don't play it much anymore tho.
For steam games would probably be Terraria with 299 hours on steam and idk how many more(a few hundred i think) pre-release.
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Dota 2 - 413 hours. I was really into it last year... And it had so many events were you could make money. Ahh the memories :D Bought myself quite a lot good games because of Dota 2. Will probably get back into it if they have another event where you can make money :D.
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I don't know the exact amount of hours, but the games I played the most are definitely the Mass Effect trilogy, with the most hours on Mass Effect 2.
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... And how many hours ?
Me, Counter Strike - 4,500 h.
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