Eric The Scruffy
Warrior
For a AAA title, a surprising amount. Not counting publishers you can officially often can have multiple large studios working together on various aspects of the game and or dlc content, and Unofficially you may have small subcontractor studios working under them. Microsoft and Bungie for example contracted out a lot of work for Halo's DLC maps to Certain Affinity.Second TYM question of the day
How many game companies does it take to finish one ?
This is a somewhat unorthodox situation though given that the primary studio leading development has walked away and given everything over to the new developer.....