When can I finish mastering Tai Chi?

Tai Chi is a lifelong exercise which focus on continual learning & practice. The many different styles of Tai Chi and its principles of learning makes many the Tai Chi practitioners work on one layer to another layer and continur to refine their skills which never actually end the journey of learning.

Therefore, there is really no level where you have truly finished master Tai Chi as there is simply so much theory & practical that you can refine and fine tune to perfection and then explore even further to achieve to the next level. This is also the beauty about Tai Chi.