The greatest number of hours in the game

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Few, I saw 57k hours in 1 game

I don't know about other games, but it seems like the most hours were in:
The Elder Scrolls 3 Morrowind - 150 hours
The Elder Scrolls 4 Oblivion - 206 hours
Dark Souls - 118 hours
Assassin's Creed 4 Black Flag - about 80 hours
Fallout 3 - 89 hours
Fallout New Wegas - 145 hours
Dragon Age Origins - 81 hours
And The Elder Scrolls 5 Skyrim - 245 hours, but I haven't questioned yet, and how much I played from previous playthroughs, I don't know

The Elder Scrolls 4 Oblivion - I played this game without interruption for about a year almost every day, there was not only 200 hours, but 400 at least.

My TOP 5 say at the moment is
Battlefield 3 - 905 hours
Witcher 3 - 486 hours
Dying Light - 323 hours
Battlefield 4 - 250 hours
GTA 5 - 164 hours

But in reality, BF3's pirated multiplayer has probably played more than that.