The game was in development for a few years. Due to the prototypes and the other used to be final builds. They were unfixable. Then the moment came and this was the final version of the game we see today. It only took 13 months to rebuild it better then before.

So if you either want to consider the game being made in 13 months. Or a couple of years. Go ahead, pick any one you want. Just some information i gave out if you guys are curious!