How many bosses are in this game?!

Out of curiosity i searched it on YouTube and there is a video that is 3 hours and a half to fight every boss in the game,and they are relatively short fights. Just a couple of minutes at most. The dark souls 2 videos aka more bosses the souls game is 2 hours. This game is so damn full with awesome content. I'm not going to live much further at this rate.