I beat this game on December 31st prior the new year celebration. It took me around 120 hours to get 98% of all trophies.
There is only one trophy I was not able to get at the time of writing which is related to "Unveil all sub-region of Greece". Which is very frustrating and for that reason I do not give a perfect 10. There are two things that makes this game no a perfect score: the first is related to get the Platinum trophy, I mean, In my perspective there should not exist any trophy that is not clear enough to obtain, in this case there are some that was not clear enough. The second is related to the repetitiveness. There are +100 of missions, +100 side quests, +100 towers/place to conquer, +100 many things. So you spend +120 hours repeating over and over again. However, the story is top notch, really well develop as previous ACs have done before.
There are several DLC that I bought that I haven't played yet. However, I think it may offer a well package of adventure / story to be there for another +30 hours or so.
The bright side of this game is that you can get for less than 40 dollars including all DLC, like around 200 hours of gaming and good story. So you have a very good value here.