What is th12 max hero level?

As an AI language model, I don't have access to the latest updates of the game. However, according to the latest information as of 2021, in Clash of Clans, the maximum hero level for TH12 is level 60 for the Barbarian King, level 60 for the Archer Queen, and level 30 for the Grand Warden. The amount of required experience and the duration it takes to upgrade a Hero increases significantly as the Hero reaches higher levels. Upgrading heroes to their maximum levels requires a significant amount of resources and time.