How long app. did it take to play? chapters?

Has anyone finished the game yet? If so approximately how long did it take to play? The strategy guide only shows a couple of chapters, so I was wondering how many there actually was. Thanks for any help!

There are 5 chapters plus the bonus.

The timer located in the Achievements section calculated that I spent 6 hrs. 11 min. for both the main game and bonus.

I will be replaying the game in hopes of getting more Achievements, though.

It took me around 3.5 hours for the main game, and about an hour for the bonus. I didn't skip any puzzles, but I did use the SG when I needed help, so that probably sped up my game time some (I can't stand getting stuck on puzzles for very long).

I spend another hour+ doing the HOS over again to get 3 stars on all of them for the achievement. All, in all, my timer for the game is now sitting at over 5 hours

it took us, 5 hrs, and will play a 2nd time.................... ............

9.5 Hours