According to GotFrag user SpartaN, the total play time for Halo 3 single player is close to 6 hours. SpartaN has also reported that the graphical presentation and lighting in the game is the best he has ever seen, surpassing even Gears of War.

SpartaN was also kind enough to upload several videos from his cell phone. While the videos are of low quality, they can be used to confirm his claim of receiving the game early and also to give a low-res peek at some portions of the game not released in trailers.

Click the links below to view the videos:

Random Gameplay
Game Menu
Retail Game Box
Random Cut Scene
Single Player Level Select - Warning, reveals number of levels & names
Multiplayer Level Select
More Game Box Videos
Game Box & Lobby - High Res!
Multiplayer Video

Related: Norwegian Game Store Sells H3 Early | Halo 3 Announced for CPL Winter