This is a massive game. Story mode will only take 20 hours or so. However, if you want to collect everything, that will take quite a bit of time. This guide accounts for all collectibles and is very detailed. It's essential for getting %100. Highly recommended!
I would recommend this to a friend
Rated 5 out of 5 stars
Great guide for showing you all the things to do besides just finishing the story mode.
You can use it as a check list to make sure you do not miss anything.