GameLengths.com gathers player's finish times for games across all platforms, and gives you more info on the average time to finish games.

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Game Avg time
Castlevania Puzzle: Encore of the Night 5 hours, 15 mins (1 play times)
Cat Physics 3 hours, 12 mins (1 play times)
Cave Bowling 1 hours, 0 mins (1 play times)
Final Fantasy 18 hours, 0 mins (2 play times)
Infinity Blade 17 hours, 0 mins (1 play times)
Infinity Blade II 4 hours, 10 mins (1 play times)
Lego Harry Potter: Years 1-4 28 hours, 42 mins (1 play times)
Puzzle Agent 5 hours, 8 mins (3 play times)
Puzzle Quest 31 hours, 36 mins (1 play times)
Puzzle Quest 2 19 hours, 54 mins (2 play times)
Sam & Max: The Devil's Playhouse 8 hours, 15 mins (1 play times)
Space Invaders Infinity Gene 5 hours, 15 mins (1 play times)
The Adventures of Tintin: The Secret of the Unicorn 6 hours, 30 mins (1 play times)
The Incident 3 hours, 45 mins (1 play times)
The Secret Of Monkey Island (SE) 7 hours, 30 mins (2 play times)
Toy Story 3 10 hours, 32 mins (1 play times)