I played this through in one sitting, so can confidently state that it is about three hours worth of playing time from beginning to end, give or take a little depending how good you are at hidden object games, if you use hints, and so on. I would not consider it to be worth the price with the short playing time, unless you really love the genre, but having gotten it in a bundle myself I definitely paid less than it was worth, so I can't complain about my cost. In any case, keep an eye out for a sale if you're interested.
As to the gameplay itself, it really is rather straightforward and not terribly challenging. There were only a handful of times when I had trouble finding something or solving a puzzle, only to find that the answer was basically right in front of my face, of course. Fortunately, if you do get stuck there is a hint system you can use to show you where an item is or the next step in a puzzle, so there's no reason for a relaxing game to become at all frustrating. Unfortunately, the ravens that you collect in order to add to your hint total are a little bit too plentiful, so that even using the hints whenever I was getting at all annoyed with the time spent searching, I still finished with ten or so remaining. Also, I would end up using a hint for kind of lame reasons, like not lining the next item in the puzzle up exactly right. In other words, it's a little bit touchy at times. Just remember, what you think is the solution probably is. You just may need to adjust your positioning slightly.
All of this being said, it is rather fun as far as hidden object games go, and that has never been a preferred genre of mine. As an Edgar Allan Poe fan, I found the concept of building the game around the mystery of his death to be intriguing, the overall story quite well done, and the gane performance flawless. I run Windows 8 and had absolutely no issues. So, this is definitely a nice way to have a few relaxing hours of casual gameplay with no time limits or losing or anything, when you're in the mood for that kind of thing.